| Jan. | Feb. | Mar. | Apr. | May | June | July | Aug. | Sept. | Oct. | Nov. | Dec. | Q1 | Q2 | Q3 | Q4 | Annual | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Capacity (percent of 2002 output) |
|||||||||||||||||
| 1975 | 59.8 | 59.9 | 60.0 | 60.2 | 60.3 | 60.4 | 60.5 | 60.6 | 60.7 | 60.8 | 61.0 | 61.1 | 59.9 | 60.3 | 60.6 | 61.0 | 60.4 |
| 1976 | 61.2 | 61.3 | 61.5 | 61.6 | 61.7 | 61.9 | 62.0 | 62.1 | 62.3 | 62.4 | 62.6 | 62.7 | 61.3 | 61.7 | 62.1 | 62.6 | 61.9 |
| 1977 | 62.9 | 63.0 | 63.2 | 63.4 | 63.5 | 63.7 | 63.9 | 64.1 | 64.3 | 64.5 | 64.6 | 64.8 | 63.0 | 63.5 | 64.1 | 64.6 | 63.8 |
| 1978 | 65.0 | 65.2 | 65.4 | 65.6 | 65.7 | 65.9 | 66.1 | 66.2 | 66.4 | 66.6 | 66.7 | 66.9 | 65.2 | 65.7 | 66.2 | 66.7 | 66.0 |
| 1979 | 67.0 | 67.2 | 67.3 | 67.5 | 67.7 | 67.8 | 68.0 | 68.1 | 68.2 | 68.4 | 68.5 | 68.7 | 67.2 | 67.7 | 68.1 | 68.5 | 67.9 |
| 1980 | 68.8 | 68.9 | 69.1 | 69.2 | 69.3 | 69.5 | 69.6 | 69.8 | 69.9 | 70.0 | 70.2 | 70.3 | 68.9 | 69.3 | 69.8 | 70.2 | 69.6 |
| 1981 | 70.5 | 70.6 | 70.8 | 70.9 | 71.1 | 71.3 | 71.4 | 71.6 | 71.8 | 71.9 | 72.1 | 72.3 | 70.6 | 71.1 | 71.6 | 72.1 | 71.4 |
| 1982 | 72.5 | 72.6 | 72.8 | 72.9 | 73.1 | 73.3 | 73.4 | 73.5 | 73.6 | 73.7 | 73.8 | 73.9 | 72.6 | 73.1 | 73.5 | 73.8 | 73.3 |
| 1983 | 74.0 | 74.0 | 74.0 | 74.1 | 74.1 | 74.1 | 74.2 | 74.2 | 74.2 | 74.3 | 74.3 | 74.4 | 74.0 | 74.1 | 74.2 | 74.3 | 74.2 |
| 1984 | 74.5 | 74.5 | 74.6 | 74.7 | 74.9 | 75.0 | 75.1 | 75.3 | 75.4 | 75.6 | 75.7 | 75.9 | 74.6 | 74.9 | 75.3 | 75.7 | 75.1 |
| 1985 | 76.1 | 76.3 | 76.5 | 76.6 | 76.8 | 77.0 | 77.2 | 77.4 | 77.5 | 77.7 | 77.8 | 77.9 | 76.3 | 76.8 | 77.4 | 77.8 | 77.1 |
| 1986 | 78.1 | 78.2 | 78.3 | 78.4 | 78.5 | 78.6 | 78.6 | 78.7 | 78.8 | 78.9 | 79.0 | 79.1 | 78.2 | 78.5 | 78.7 | 79.0 | 78.6 |
| 1987 | 79.3 | 79.4 | 79.5 | 79.7 | 79.8 | 79.9 | 80.1 | 80.2 | 80.3 | 80.4 | 80.5 | 80.6 | 79.4 | 79.8 | 80.2 | 80.5 | 80.0 |
| 1988 | 80.6 | 80.7 | 80.8 | 80.8 | 80.9 | 80.9 | 80.9 | 81.0 | 81.1 | 81.1 | 81.2 | 81.3 | 80.7 | 80.9 | 81.0 | 81.2 | 80.9 |
| 1989 | 81.4 | 81.5 | 81.7 | 81.8 | 82.0 | 82.1 | 82.3 | 82.5 | 82.6 | 82.8 | 83.0 | 83.2 | 81.5 | 82.0 | 82.5 | 83.0 | 82.2 |
| 1990 | 83.3 | 83.5 | 83.7 | 83.9 | 84.0 | 84.2 | 84.3 | 84.5 | 84.6 | 84.8 | 84.9 | 85.0 | 83.5 | 84.0 | 84.5 | 84.9 | 84.2 |
| 1991 | 85.2 | 85.3 | 85.4 | 85.5 | 85.6 | 85.8 | 85.9 | 86.0 | 86.1 | 86.2 | 86.3 | 86.5 | 85.3 | 85.6 | 86.0 | 86.3 | 85.8 |
| 1992 | 86.6 | 86.7 | 86.9 | 87.0 | 87.2 | 87.3 | 87.5 | 87.6 | 87.8 | 88.0 | 88.1 | 88.3 | 86.7 | 87.2 | 87.6 | 88.1 | 87.4 |
| 1993 | 88.4 | 88.5 | 88.7 | 88.8 | 88.9 | 89.1 | 89.2 | 89.3 | 89.5 | 89.6 | 89.8 | 90.0 | 88.5 | 88.9 | 89.3 | 89.8 | 89.2 |
| 1994 | 90.1 | 90.3 | 90.5 | 90.8 | 91.0 | 91.2 | 91.5 | 91.8 | 92.1 | 92.4 | 92.8 | 93.1 | 90.3 | 91.0 | 91.8 | 92.8 | 91.5 |
| 1995 | 93.5 | 93.8 | 94.2 | 94.6 | 95.0 | 95.4 | 95.8 | 96.2 | 96.6 | 97.0 | 97.5 | 97.9 | 93.8 | 95.0 | 96.2 | 97.5 | 95.6 |
| 1996 | 98.3 | 98.7 | 99.2 | 99.6 | 100.0 | 100.4 | 100.9 | 101.3 | 101.7 | 102.2 | 102.7 | 103.1 | 98.7 | 100.0 | 101.3 | 102.7 | 100.7 |
| 1997 | 103.6 | 104.2 | 104.7 | 105.2 | 105.8 | 106.4 | 107.0 | 107.7 | 108.4 | 109.0 | 109.7 | 110.5 | 104.2 | 105.8 | 107.7 | 109.7 | 106.9 |
| 1998 | 111.2 | 111.9 | 112.6 | 113.3 | 114.0 | 114.6 | 115.2 | 115.8 | 116.4 | 116.9 | 117.5 | 118.0 | 111.9 | 114.0 | 115.8 | 117.5 | 114.8 |
| 1999 | 118.5 | 119.0 | 119.5 | 120.0 | 120.5 | 120.9 | 121.4 | 121.8 | 122.3 | 122.8 | 123.2 | 123.7 | 119.0 | 120.4 | 121.8 | 123.2 | 121.1 |
| 2000 | 124.2 | 124.6 | 125.1 | 125.5 | 126.0 | 126.4 | 126.8 | 127.2 | 127.7 | 128.1 | 128.5 | 128.9 | 124.6 | 126.0 | 127.2 | 128.5 | 126.6 |
| 2001 | 129.2 | 129.6 | 130.0 | 130.3 | 130.6 | 130.9 | 131.2 | 131.5 | 131.8 | 132.0 | 132.2 | 132.5 | 129.6 | 130.6 | 131.5 | 132.2 | 131.0 |
| 2002 | 132.6 | 132.8 | 132.9 | 133.0 | 133.1 | 133.2 | 133.2 | 133.2 | 133.2 | 133.2 | 133.2 | 133.2 | 132.8 | 133.1 | 133.2 | 133.2 | 133.1 |
| 2003 | 133.1 | 133.1 | 133.0 | 133.0 | 133.0 | 132.9 | 132.9 | 132.9 | 132.9 | 132.9 | 132.9 | 132.9 | 133.1 | 133.0 | 132.9 | 132.9 | 133.0 |
| 2004 | 133.0 | 133.0 | 133.0 | 133.1 | 133.1 | 133.2 | 133.3 | 133.4 | 133.5 | 133.6 | 133.7 | 133.9 | 133.0 | 133.1 | 133.4 | 133.7 | 133.3 |
| 2005 | 134.0 | 134.2 | 134.3 | 134.5 | 134.7 | 134.9 | 135.1 | 135.3 | 135.5 | 134.2 | 134.7 | 135.3 | |||||
| Utilization (percent) |
|||||||||||||||||
| 1975 | 77.4 | 75.3 | 74.4 | 74.3 | 74.1 | 74.4 | 75.1 | 75.6 | 76.5 | 76.6 | 76.6 | 77.4 | 75.7 | 74.3 | 75.7 | 76.9 | 75.6 |
| 1976 | 78.4 | 78.9 | 78.8 | 79.2 | 79.3 | 79.2 | 79.4 | 79.8 | 79.8 | 79.8 | 80.8 | 81.4 | 78.7 | 79.2 | 79.7 | 80.6 | 79.6 |
| 1977 | 80.7 | 81.7 | 82.5 | 83.1 | 83.5 | 83.8 | 83.8 | 83.7 | 83.8 | 83.8 | 83.6 | 83.5 | 81.7 | 83.5 | 83.8 | 83.6 | 83.1 |
| 1978 | 82.1 | 82.3 | 83.5 | 85.0 | 85.1 | 85.5 | 85.2 | 85.3 | 85.3 | 85.8 | 86.3 | 86.6 | 82.6 | 85.2 | 85.3 | 86.2 | 84.8 |
| 1979 | 85.8 | 86.1 | 86.2 | 85.1 | 85.5 | 85.3 | 85.0 | 84.2 | 84.1 | 84.4 | 84.1 | 84.1 | 86.0 | 85.3 | 84.4 | 84.2 | 85.0 |
| 1980 | 84.2 | 84.1 | 83.7 | 81.9 | 79.6 | 78.5 | 77.8 | 77.9 | 79.0 | 79.8 | 81.0 | 81.3 | 84.0 | 80.0 | 78.2 | 80.7 | 80.7 |
| 1981 | 80.7 | 80.1 | 80.4 | 79.8 | 80.2 | 80.4 | 80.7 | 80.6 | 79.9 | 79.1 | 78.1 | 77.0 | 80.4 | 80.1 | 80.4 | 78.1 | 79.7 |
| 1982 | 75.4 | 76.6 | 75.9 | 75.1 | 74.4 | 74.0 | 73.6 | 72.9 | 72.5 | 71.8 | 71.4 | 70.7 | 76.0 | 74.5 | 73.0 | 71.3 | 73.7 |
| 1983 | 72.0 | 71.5 | 72.1 | 72.9 | 73.4 | 73.8 | 74.9 | 75.7 | 76.8 | 77.5 | 77.6 | 77.9 | 71.8 | 73.4 | 75.8 | 77.7 | 74.7 |
| 1984 | 79.5 | 79.7 | 80.0 | 80.4 | 80.7 | 80.8 | 80.9 | 80.9 | 80.6 | 80.3 | 80.5 | 80.3 | 79.7 | 80.7 | 80.8 | 80.4 | 80.4 |
| 1985 | 79.9 | 80.1 | 80.0 | 79.7 | 79.6 | 79.4 | 78.7 | 78.9 | 79.1 | 78.6 | 78.8 | 79.4 | 80.0 | 79.6 | 78.9 | 78.9 | 79.4 |
| 1986 | 79.7 | 79.0 | 78.4 | 78.3 | 78.4 | 78.0 | 78.4 | 78.2 | 78.3 | 78.5 | 78.7 | 79.3 | 79.0 | 78.2 | 78.3 | 78.9 | 78.6 |
| 1987 | 79.0 | 79.8 | 79.8 | 80.1 | 80.6 | 80.8 | 81.2 | 81.6 | 81.7 | 82.8 | 83.1 | 83.4 | 79.6 | 80.5 | 81.5 | 83.1 | 81.2 |
| 1988 | 83.4 | 83.6 | 83.7 | 84.1 | 84.0 | 84.2 | 84.3 | 84.6 | 84.3 | 84.7 | 84.8 | 85.0 | 83.6 | 84.1 | 84.4 | 84.8 | 84.2 |
| 1989 | 85.1 | 84.6 | 84.7 | 84.5 | 83.8 | 83.6 | 82.7 | 83.3 | 82.8 | 82.6 | 82.7 | 83.1 | 84.8 | 84.0 | 82.9 | 82.8 | 83.6 |
| 1990 | 82.4 | 82.9 | 83.2 | 83.0 | 82.9 | 82.9 | 82.7 | 82.8 | 82.8 | 82.0 | 80.9 | 80.2 | 82.8 | 82.9 | 82.7 | 81.1 | 82.4 |
| 1991 | 79.7 | 79.1 | 78.6 | 78.6 | 79.3 | 80.0 | 79.9 | 79.9 | 80.5 | 80.2 | 80.0 | 79.7 | 79.1 | 79.3 | 80.1 | 80.0 | 79.6 |
| 1992 | 79.1 | 79.5 | 80.0 | 80.4 | 80.6 | 80.5 | 81.0 | 80.4 | 80.5 | 80.9 | 81.0 | 81.0 | 79.6 | 80.5 | 80.6 | 81.0 | 80.4 |
| 1993 | 81.2 | 81.4 | 81.3 | 81.4 | 81.0 | 81.1 | 81.2 | 81.1 | 81.4 | 81.8 | 82.0 | 82.3 | 81.3 | 81.1 | 81.2 | 82.0 | 81.4 |
| 1994 | 82.5 | 82.3 | 83.0 | 83.2 | 83.5 | 83.8 | 83.8 | 83.9 | 83.8 | 84.2 | 84.5 | 85.0 | 82.6 | 83.5 | 83.8 | 84.6 | 83.6 |
| 1995 | 85.0 | 84.7 | 84.5 | 84.1 | 83.9 | 83.8 | 83.1 | 83.9 | 83.8 | 83.3 | 83.2 | 83.2 | 84.7 | 83.9 | 83.6 | 83.2 | 83.9 |
| 1996 | 82.1 | 83.0 | 82.5 | 82.9 | 83.1 | 83.5 | 83.0 | 83.2 | 83.3 | 82.9 | 83.3 | 83.5 | 82.5 | 83.2 | 83.1 | 83.3 | 83.0 |
| 1997 | 83.3 | 83.9 | 84.1 | 83.6 | 83.6 | 83.5 | 83.5 | 84.0 | 84.3 | 84.3 | 84.6 | 84.4 | 83.7 | 83.6 | 83.9 | 84.4 | 83.9 |
| 1998 | 84.2 | 83.7 | 83.3 | 83.1 | 83.1 | 82.2 | 81.5 | 82.8 | 82.3 | 82.5 | 82.1 | 81.9 | 83.7 | 82.8 | 82.2 | 82.2 | 82.7 |
| 1999 | 82.0 | 82.0 | 81.8 | 81.7 | 82.0 | 81.7 | 81.9 | 82.0 | 81.3 | 82.1 | 82.2 | 82.6 | 81.9 | 81.8 | 81.7 | 82.3 | 81.9 |
| 2000 | 82.5 | 82.5 | 82.5 | 82.7 | 82.7 | 82.5 | 82.0 | 81.4 | 81.5 | 80.9 | 80.7 | 80.1 | 82.5 | 82.6 | 81.6 | 80.6 | 81.8 |
| 2001 | 79.2 | 78.4 | 77.9 | 77.6 | 76.9 | 76.3 | 75.9 | 75.4 | 75.0 | 74.5 | 74.0 | 73.9 | 78.5 | 76.9 | 75.4 | 74.2 | 76.3 |
| 2002 | 74.3 | 74.1 | 74.7 | 74.9 | 75.2 | 75.8 | 75.6 | 75.6 | 75.6 | 75.3 | 75.5 | 75.2 | 74.4 | 75.3 | 75.6 | 75.3 | 75.1 |
| 2003 | 75.5 | 75.6 | 75.4 | 74.9 | 74.9 | 75.1 | 75.4 | 75.5 | 76.0 | 76.1 | 76.8 | 76.9 | 75.5 | 74.9 | 75.6 | 76.6 | 75.7 |
| 2004 | 77.2 | 77.8 | 77.6 | 78.1 | 78.8 | 78.4 | 78.8 | 79.0 | 78.7 | 79.2 | 79.3 | 79.7 | 77.5 | 78.4 | 78.8 | 79.4 | 78.6 |
| 2005 | 79.8 | 80.0 | 79.9 | 79.7 | 79.8 | 80.3 | 80.1 | 80.3 | 79.0 | 79.9 | 79.9 | 79.8 |
Note: Estimates from July 2005 through September 2005 are subject to further revision in the upcoming monthly releases.