| Jan. | Feb. | Mar. | Apr. | May | June | July | Aug. | Sept. | Oct. | Nov. | Dec. | Q1 | Q2 | Q3 | Q4 | Annual | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Capacity (percent of 2002 output) |
|||||||||||||||||
| 1976 | 59.9 | 60.0 | 60.2 | 60.3 | 60.4 | 60.6 | 60.7 | 60.8 | 60.9 | 61.1 | 61.2 | 61.4 | 60.0 | 60.4 | 60.8 | 61.2 | 60.6 |
| 1977 | 61.5 | 61.7 | 61.8 | 62.0 | 62.2 | 62.4 | 62.5 | 62.7 | 62.9 | 63.1 | 63.3 | 63.5 | 61.7 | 62.2 | 62.7 | 63.3 | 62.5 |
| 1978 | 63.7 | 63.9 | 64.1 | 64.2 | 64.4 | 64.6 | 64.8 | 65.0 | 65.1 | 65.3 | 65.5 | 65.6 | 63.9 | 64.4 | 65.0 | 65.5 | 64.7 |
| 1979 | 65.8 | 65.9 | 66.1 | 66.2 | 66.4 | 66.5 | 66.7 | 66.8 | 66.9 | 67.1 | 67.2 | 67.4 | 65.9 | 66.4 | 66.8 | 67.2 | 66.6 |
| 1980 | 67.5 | 67.6 | 67.8 | 67.9 | 68.0 | 68.2 | 68.3 | 68.5 | 68.6 | 68.8 | 68.9 | 69.1 | 67.6 | 68.0 | 68.5 | 68.9 | 68.3 |
| 1981 | 69.2 | 69.4 | 69.6 | 69.7 | 69.9 | 70.1 | 70.2 | 70.4 | 70.6 | 70.8 | 70.9 | 71.1 | 69.4 | 69.9 | 70.4 | 70.9 | 70.2 |
| 1982 | 71.3 | 71.4 | 71.6 | 71.8 | 71.9 | 72.1 | 72.2 | 72.3 | 72.4 | 72.5 | 72.6 | 72.7 | 71.4 | 71.9 | 72.3 | 72.6 | 72.1 |
| 1983 | 72.7 | 72.8 | 72.8 | 72.9 | 72.9 | 72.9 | 73.0 | 73.0 | 73.0 | 73.1 | 73.2 | 73.2 | 72.8 | 72.9 | 73.0 | 73.2 | 73.0 |
| 1984 | 73.3 | 73.4 | 73.5 | 73.6 | 73.7 | 73.8 | 74.0 | 74.1 | 74.3 | 74.5 | 74.7 | 74.8 | 73.4 | 73.7 | 74.1 | 74.7 | 74.0 |
| 1985 | 75.0 | 75.2 | 75.4 | 75.6 | 75.8 | 76.0 | 76.2 | 76.3 | 76.5 | 76.6 | 76.8 | 76.9 | 75.2 | 75.8 | 76.3 | 76.8 | 76.0 |
| 1986 | 77.0 | 77.1 | 77.2 | 77.3 | 77.4 | 77.5 | 77.6 | 77.7 | 77.8 | 77.9 | 78.0 | 78.1 | 77.1 | 77.4 | 77.7 | 78.0 | 77.5 |
| 1987 | 78.2 | 78.4 | 78.5 | 78.7 | 78.9 | 79.0 | 79.2 | 79.3 | 79.5 | 79.6 | 79.7 | 79.8 | 78.4 | 78.9 | 79.3 | 79.7 | 79.1 |
| 1988 | 79.9 | 79.9 | 80.0 | 80.1 | 80.1 | 80.1 | 80.2 | 80.2 | 80.3 | 80.4 | 80.5 | 80.5 | 79.9 | 80.1 | 80.2 | 80.5 | 80.2 |
| 1989 | 80.6 | 80.8 | 80.9 | 81.0 | 81.2 | 81.3 | 81.5 | 81.6 | 81.8 | 82.0 | 82.2 | 82.3 | 80.8 | 81.2 | 81.6 | 82.2 | 81.4 |
| 1990 | 82.5 | 82.7 | 82.8 | 83.0 | 83.2 | 83.3 | 83.5 | 83.6 | 83.8 | 83.9 | 84.1 | 84.2 | 82.7 | 83.2 | 83.6 | 84.1 | 83.4 |
| 1991 | 84.4 | 84.5 | 84.6 | 84.8 | 84.9 | 85.0 | 85.1 | 85.3 | 85.4 | 85.5 | 85.6 | 85.8 | 84.5 | 84.9 | 85.3 | 85.6 | 85.1 |
| 1992 | 85.9 | 86.1 | 86.2 | 86.4 | 86.5 | 86.7 | 86.9 | 87.0 | 87.2 | 87.4 | 87.5 | 87.7 | 86.1 | 86.5 | 87.0 | 87.5 | 86.8 |
| 1993 | 87.8 | 87.9 | 88.1 | 88.2 | 88.3 | 88.4 | 88.6 | 88.7 | 88.8 | 89.0 | 89.1 | 89.3 | 87.9 | 88.3 | 88.7 | 89.1 | 88.5 |
| 1994 | 89.5 | 89.7 | 89.9 | 90.1 | 90.4 | 90.6 | 90.9 | 91.2 | 91.5 | 91.8 | 92.2 | 92.5 | 89.7 | 90.4 | 91.2 | 92.2 | 90.9 |
| 1995 | 92.9 | 93.2 | 93.6 | 94.0 | 94.4 | 94.8 | 95.1 | 95.5 | 95.9 | 96.4 | 96.8 | 97.2 | 93.2 | 94.4 | 95.5 | 96.8 | 95.0 |
| 1996 | 97.6 | 98.1 | 98.5 | 98.9 | 99.4 | 99.8 | 100.3 | 100.7 | 101.2 | 101.7 | 102.1 | 102.6 | 98.1 | 99.4 | 100.7 | 102.1 | 100.1 |
| 1997 | 103.1 | 103.6 | 104.1 | 104.7 | 105.2 | 105.8 | 106.4 | 107.1 | 107.7 | 108.4 | 109.1 | 109.8 | 103.6 | 105.3 | 107.1 | 109.1 | 106.3 |
| 1998 | 110.6 | 111.3 | 112.0 | 112.7 | 113.5 | 114.1 | 114.8 | 115.4 | 116.0 | 116.5 | 117.1 | 117.6 | 111.3 | 113.4 | 115.4 | 117.1 | 114.3 |
| 1999 | 118.2 | 118.7 | 119.2 | 119.7 | 120.2 | 120.7 | 121.2 | 121.7 | 122.2 | 122.7 | 123.2 | 123.7 | 118.7 | 120.2 | 121.7 | 123.2 | 120.9 |
| 2000 | 124.3 | 124.8 | 125.3 | 125.8 | 126.3 | 126.8 | 127.2 | 127.6 | 128.1 | 128.5 | 128.9 | 129.3 | 124.8 | 126.3 | 127.6 | 128.9 | 126.9 |
| 2001 | 129.6 | 130.0 | 130.3 | 130.6 | 131.0 | 131.3 | 131.6 | 131.9 | 132.1 | 132.4 | 132.7 | 132.9 | 130.0 | 131.0 | 131.8 | 132.7 | 131.4 |
| 2002 | 133.1 | 133.3 | 133.5 | 133.6 | 133.7 | 133.8 | 133.9 | 133.9 | 133.8 | 133.8 | 133.7 | 133.6 | 133.3 | 133.7 | 133.9 | 133.7 | 133.6 |
| 2003 | 133.5 | 133.3 | 133.2 | 133.0 | 132.9 | 132.8 | 132.7 | 132.6 | 132.5 | 132.5 | 132.4 | 132.4 | 133.3 | 132.9 | 132.6 | 132.4 | 132.8 |
| 2004 | 132.4 | 132.4 | 132.5 | 132.5 | 132.5 | 132.5 | 132.6 | 132.6 | 132.6 | 132.6 | 132.6 | 132.7 | 132.4 | 132.5 | 132.6 | 132.6 | 132.5 |
| 2005 | 132.7 | 132.7 | 132.8 | 132.9 | 133.0 | 133.1 | 133.2 | 133.4 | 133.6 | 133.8 | 134.1 | 134.3 | 132.7 | 133.0 | 133.4 | 134.1 | 133.3 |
| 2006 | 134.6 | 134.8 | 135.1 | 135.4 | 135.7 | 136.0 | 136.2 | 136.5 | 136.8 | 137.0 | 134.9 | 135.7 | 136.5 | ||||
| Utilization (percent) |
|||||||||||||||||
| 1976 | 78.4 | 78.9 | 78.9 | 79.2 | 79.4 | 79.2 | 79.5 | 79.9 | 79.9 | 79.9 | 80.9 | 81.5 | 78.7 | 79.3 | 79.8 | 80.7 | 79.6 |
| 1977 | 80.8 | 81.8 | 82.7 | 83.2 | 83.6 | 84.0 | 83.9 | 83.8 | 83.9 | 83.9 | 83.7 | 83.6 | 81.8 | 83.6 | 83.9 | 83.7 | 83.2 |
| 1978 | 82.2 | 82.3 | 83.6 | 85.1 | 85.1 | 85.5 | 85.2 | 85.3 | 85.3 | 85.8 | 86.2 | 86.5 | 82.7 | 85.2 | 85.3 | 86.2 | 84.9 |
| 1979 | 85.8 | 86.1 | 86.2 | 85.1 | 85.5 | 85.4 | 85.0 | 84.2 | 84.1 | 84.4 | 84.2 | 84.1 | 86.0 | 85.3 | 84.5 | 84.3 | 85.0 |
| 1980 | 84.3 | 84.2 | 83.8 | 81.9 | 79.7 | 78.5 | 77.9 | 77.9 | 79.0 | 79.8 | 81.0 | 81.3 | 84.1 | 80.1 | 78.3 | 80.7 | 80.8 |
| 1981 | 80.7 | 80.1 | 80.3 | 79.8 | 80.2 | 80.4 | 80.7 | 80.5 | 79.8 | 79.1 | 78.0 | 77.0 | 80.4 | 80.1 | 80.4 | 78.0 | 79.7 |
| 1982 | 75.3 | 76.6 | 75.9 | 75.1 | 74.4 | 74.0 | 73.6 | 72.9 | 72.5 | 71.8 | 71.4 | 70.8 | 75.9 | 74.5 | 73.0 | 71.3 | 73.7 |
| 1983 | 72.0 | 71.5 | 72.1 | 73.0 | 73.5 | 73.9 | 75.0 | 75.8 | 76.9 | 77.5 | 77.7 | 78.0 | 71.9 | 73.4 | 75.9 | 77.8 | 74.8 |
| 1984 | 79.5 | 79.8 | 80.1 | 80.5 | 80.8 | 80.9 | 81.0 | 80.9 | 80.6 | 80.3 | 80.5 | 80.4 | 79.8 | 80.7 | 80.8 | 80.4 | 80.4 |
| 1985 | 80.0 | 80.1 | 80.0 | 79.7 | 79.6 | 79.4 | 78.7 | 78.9 | 79.1 | 78.6 | 78.8 | 79.5 | 80.0 | 79.6 | 78.9 | 79.0 | 79.4 |
| 1986 | 79.8 | 79.0 | 78.4 | 78.4 | 78.4 | 78.1 | 78.5 | 78.3 | 78.3 | 78.6 | 78.8 | 79.4 | 79.1 | 78.3 | 78.4 | 78.9 | 78.7 |
| 1987 | 79.0 | 79.9 | 79.9 | 80.2 | 80.5 | 80.8 | 81.1 | 81.6 | 81.6 | 82.7 | 83.0 | 83.3 | 79.6 | 80.5 | 81.4 | 83.0 | 81.1 |
| 1988 | 83.2 | 83.5 | 83.6 | 84.0 | 83.9 | 84.0 | 84.1 | 84.5 | 84.2 | 84.6 | 84.7 | 84.9 | 83.4 | 84.0 | 84.2 | 84.7 | 84.1 |
| 1989 | 85.0 | 84.5 | 84.6 | 84.4 | 83.7 | 83.6 | 82.6 | 83.3 | 82.8 | 82.6 | 82.7 | 83.1 | 84.7 | 83.9 | 82.9 | 82.8 | 83.6 |
| 1990 | 82.4 | 83.0 | 83.2 | 82.9 | 82.9 | 83.0 | 82.7 | 82.8 | 82.8 | 82.1 | 80.9 | 80.2 | 82.9 | 82.9 | 82.7 | 81.1 | 82.4 |
| 1991 | 79.7 | 79.0 | 78.5 | 78.6 | 79.3 | 79.9 | 79.8 | 79.8 | 80.4 | 80.1 | 79.9 | 79.5 | 79.1 | 79.3 | 80.0 | 79.9 | 79.6 |
| 1992 | 79.0 | 79.4 | 79.9 | 80.3 | 80.4 | 80.3 | 80.8 | 80.3 | 80.3 | 80.8 | 80.9 | 80.8 | 79.4 | 80.3 | 80.5 | 80.8 | 80.3 |
| 1993 | 81.1 | 81.3 | 81.1 | 81.3 | 80.9 | 81.0 | 81.2 | 81.1 | 81.4 | 81.8 | 82.0 | 82.3 | 81.2 | 81.1 | 81.2 | 82.1 | 81.4 |
| 1994 | 82.6 | 82.4 | 83.1 | 83.3 | 83.5 | 83.8 | 83.7 | 83.8 | 83.8 | 84.2 | 84.4 | 85.1 | 82.7 | 83.5 | 83.8 | 84.6 | 83.6 |
| 1995 | 85.1 | 84.8 | 84.6 | 84.1 | 84.0 | 83.9 | 83.2 | 84.0 | 84.0 | 83.5 | 83.4 | 83.3 | 84.8 | 84.0 | 83.7 | 83.4 | 84.0 |
| 1996 | 82.3 | 83.2 | 82.6 | 83.0 | 83.2 | 83.6 | 83.0 | 83.2 | 83.3 | 83.0 | 83.3 | 83.5 | 82.7 | 83.3 | 83.2 | 83.3 | 83.1 |
| 1997 | 83.3 | 83.8 | 84.1 | 83.6 | 83.6 | 83.5 | 83.5 | 84.0 | 84.3 | 84.4 | 84.7 | 84.5 | 83.7 | 83.6 | 83.9 | 84.5 | 83.9 |
| 1998 | 84.3 | 83.9 | 83.3 | 83.2 | 83.2 | 82.3 | 81.6 | 82.9 | 82.3 | 82.5 | 82.0 | 81.9 | 83.8 | 82.9 | 82.3 | 82.2 | 82.8 |
| 1999 | 82.1 | 82.1 | 81.9 | 81.8 | 82.1 | 81.6 | 81.8 | 81.9 | 81.3 | 82.0 | 82.2 | 82.6 | 82.0 | 81.8 | 81.7 | 82.3 | 81.9 |
| 2000 | 82.3 | 82.3 | 82.3 | 82.6 | 82.5 | 82.3 | 81.8 | 81.3 | 81.4 | 80.8 | 80.5 | 79.9 | 82.3 | 82.5 | 81.5 | 80.4 | 81.7 |
| 2001 | 79.2 | 78.5 | 78.0 | 77.5 | 76.8 | 76.2 | 75.7 | 75.3 | 74.8 | 74.2 | 73.7 | 73.6 | 78.5 | 76.9 | 75.3 | 73.8 | 76.1 |
| 2002 | 73.8 | 73.8 | 74.3 | 74.5 | 74.7 | 75.4 | 75.1 | 75.2 | 75.3 | 75.1 | 75.5 | 75.2 | 74.0 | 74.9 | 75.2 | 75.3 | 74.8 |
| 2003 | 75.7 | 76.0 | 75.9 | 75.4 | 75.4 | 75.7 | 76.0 | 76.0 | 76.4 | 76.4 | 77.1 | 77.1 | 75.9 | 75.5 | 76.1 | 76.8 | 76.1 |
| 2004 | 77.2 | 77.8 | 77.3 | 77.8 | 78.2 | 77.7 | 78.1 | 78.3 | 78.2 | 78.7 | 78.9 | 79.4 | 77.5 | 77.9 | 78.2 | 79.0 | 78.1 |
| 2005 | 79.6 | 80.0 | 79.9 | 79.9 | 80.2 | 80.6 | 80.5 | 80.7 | 79.2 | 80.0 | 80.7 | 81.3 | 79.8 | 80.2 | 80.1 | 80.7 | 80.2 |
| 2006 | 81.1 | 81.1 | 81.4 | 81.9 | 81.7 | 82.3 | 82.4 | 82.5 | 81.9 | 82.0 | 81.2 | 82.0 | 82.3 | ||||
Note: Estimates from August 2006 through October 2006 are subject to further revision in the upcoming monthly releases.