| Jan. | Feb. | Mar. | Apr. | May | June | July | Aug. | Sept. | Oct. | Nov. | Dec. | Q1 | Q2 | Q3 | Q4 | Annual | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Capacity (percent of 2002 output) |
|||||||||||||||||
| 1978 | 65.0 | 65.2 | 65.4 | 65.6 | 65.7 | 65.9 | 66.1 | 66.3 | 66.5 | 66.6 | 66.8 | 66.9 | 65.2 | 65.7 | 66.3 | 66.8 | 66.0 |
| 1979 | 67.1 | 67.3 | 67.4 | 67.6 | 67.7 | 67.8 | 68.0 | 68.1 | 68.3 | 68.4 | 68.6 | 68.7 | 67.3 | 67.7 | 68.1 | 68.6 | 67.9 |
| 1980 | 68.8 | 69.0 | 69.1 | 69.3 | 69.4 | 69.6 | 69.7 | 69.9 | 70.1 | 70.2 | 70.4 | 70.5 | 69.0 | 69.4 | 69.9 | 70.4 | 69.7 |
| 1981 | 70.7 | 70.9 | 71.0 | 71.2 | 71.4 | 71.5 | 71.7 | 71.9 | 72.0 | 72.2 | 72.4 | 72.5 | 70.9 | 71.4 | 71.9 | 72.4 | 71.6 |
| 1982 | 72.7 | 72.8 | 73.0 | 73.1 | 73.3 | 73.4 | 73.5 | 73.6 | 73.7 | 73.8 | 73.9 | 73.9 | 72.8 | 73.3 | 73.6 | 73.9 | 73.4 |
| 1983 | 74.0 | 74.0 | 74.1 | 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 | 74.6 | 74.7 | 74.8 | 74.9 | 75.0 | 75.2 | 75.4 | 75.5 | 75.7 | 75.9 | 76.0 | 74.6 | 74.9 | 75.4 | 75.9 | 75.2 |
| 1985 | 76.2 | 76.4 | 76.6 | 76.8 | 77.0 | 77.2 | 77.3 | 77.5 | 77.6 | 77.8 | 77.9 | 78.0 | 76.4 | 77.0 | 77.5 | 77.9 | 77.2 |
| 1986 | 78.2 | 78.3 | 78.4 | 78.4 | 78.5 | 78.6 | 78.7 | 78.8 | 78.9 | 79.0 | 79.1 | 79.2 | 78.3 | 78.5 | 78.8 | 79.1 | 78.7 |
| 1987 | 79.3 | 79.5 | 79.6 | 79.8 | 79.9 | 80.1 | 80.3 | 80.4 | 80.6 | 80.7 | 80.8 | 80.9 | 79.5 | 79.9 | 80.4 | 80.8 | 80.2 |
| 1988 | 81.0 | 81.1 | 81.2 | 81.2 | 81.3 | 81.3 | 81.4 | 81.4 | 81.5 | 81.6 | 81.7 | 81.8 | 81.1 | 81.3 | 81.4 | 81.7 | 81.4 |
| 1989 | 81.9 | 82.0 | 82.1 | 82.2 | 82.4 | 82.5 | 82.7 | 82.9 | 83.0 | 83.2 | 83.4 | 83.5 | 82.0 | 82.4 | 82.9 | 83.4 | 82.7 |
| 1990 | 83.7 | 83.9 | 84.1 | 84.2 | 84.4 | 84.6 | 84.7 | 84.9 | 85.0 | 85.2 | 85.3 | 85.5 | 83.9 | 84.4 | 84.9 | 85.3 | 84.6 |
| 1991 | 85.6 | 85.7 | 85.8 | 86.0 | 86.1 | 86.2 | 86.3 | 86.4 | 86.5 | 86.6 | 86.7 | 86.9 | 85.7 | 86.1 | 86.4 | 86.7 | 86.2 |
| 1992 | 87.0 | 87.1 | 87.3 | 87.4 | 87.6 | 87.8 | 88.0 | 88.1 | 88.3 | 88.5 | 88.6 | 88.8 | 87.1 | 87.6 | 88.1 | 88.6 | 87.9 |
| 1993 | 88.9 | 89.1 | 89.2 | 89.3 | 89.4 | 89.5 | 89.6 | 89.7 | 89.8 | 90.0 | 90.1 | 90.3 | 89.1 | 89.4 | 89.7 | 90.1 | 89.6 |
| 1994 | 90.4 | 90.6 | 90.9 | 91.1 | 91.3 | 91.6 | 91.9 | 92.2 | 92.5 | 92.8 | 93.1 | 93.4 | 90.7 | 91.4 | 92.2 | 93.1 | 91.8 |
| 1995 | 93.8 | 94.1 | 94.4 | 94.8 | 95.1 | 95.5 | 95.8 | 96.2 | 96.6 | 97.0 | 97.4 | 97.8 | 94.1 | 95.1 | 96.2 | 97.4 | 95.7 |
| 1996 | 98.3 | 98.7 | 99.2 | 99.6 | 100.1 | 100.6 | 101.0 | 101.5 | 102.0 | 102.5 | 103.0 | 103.5 | 98.7 | 100.1 | 101.5 | 103.0 | 100.8 |
| 1997 | 104.0 | 104.5 | 105.1 | 105.6 | 106.2 | 106.8 | 107.4 | 108.0 | 108.7 | 109.4 | 110.1 | 110.8 | 104.5 | 106.2 | 108.0 | 110.1 | 107.2 |
| 1998 | 111.5 | 112.2 | 112.9 | 113.6 | 114.3 | 115.0 | 115.6 | 116.2 | 116.7 | 117.3 | 117.8 | 118.4 | 112.2 | 114.3 | 116.2 | 117.8 | 115.1 |
| 1999 | 118.9 | 119.4 | 119.8 | 120.3 | 120.8 | 121.2 | 121.7 | 122.1 | 122.6 | 123.1 | 123.5 | 124.0 | 119.4 | 120.8 | 122.1 | 123.5 | 121.4 |
| 2000 | 124.4 | 124.9 | 125.3 | 125.8 | 126.2 | 126.6 | 127.0 | 127.4 | 127.8 | 128.2 | 128.6 | 129.0 | 124.9 | 126.2 | 127.4 | 128.6 | 126.8 |
| 2001 | 129.4 | 129.8 | 130.1 | 130.5 | 130.8 | 131.2 | 131.5 | 131.8 | 132.1 | 132.4 | 132.7 | 132.9 | 129.8 | 130.8 | 131.8 | 132.7 | 131.3 |
| 2002 | 133.2 | 133.4 | 133.6 | 133.7 | 133.8 | 133.9 | 133.9 | 134.0 | 133.9 | 133.9 | 133.8 | 133.7 | 133.4 | 133.8 | 133.9 | 133.8 | 133.7 |
| 2003 | 133.6 | 133.5 | 133.4 | 133.3 | 133.2 | 133.1 | 133.1 | 133.0 | 133.0 | 133.0 | 132.9 | 132.9 | 133.5 | 133.2 | 133.0 | 132.9 | 133.2 |
| 2004 | 133.0 | 133.0 | 133.0 | 133.0 | 133.0 | 133.0 | 133.1 | 133.1 | 133.1 | 133.1 | 133.1 | 133.2 | 133.0 | 133.0 | 133.1 | 133.2 | 133.1 |
| 2005 | 133.2 | 133.3 | 133.3 | 133.4 | 133.5 | 133.6 | 133.7 | 133.8 | 134.0 | 134.1 | 134.3 | 134.4 | 133.3 | 133.5 | 133.9 | 134.3 | 133.7 |
| 2006 | 134.6 | 134.7 | 134.9 | 135.0 | 135.2 | 135.3 | 135.4 | 135.6 | 135.7 | 135.9 | 136.0 | 136.2 | 134.7 | 135.2 | 135.6 | 136.1 | 135.4 |
| 2007 | 136.4 | 136.6 | 136.8 | 137.0 | 137.2 | 137.4 | 137.6 | 137.9 | 138.1 | 138.3 | 138.5 | 138.7 | 136.6 | 137.2 | 137.9 | 138.5 | 137.5 |
| 2008 | 139.0 | 139.1 | |||||||||||||||
| Utilization (percent) |
|||||||||||||||||
| 1978 | 82.3 | 82.4 | 83.6 | 85.1 | 85.2 | 85.6 | 85.3 | 85.4 | 85.4 | 85.9 | 86.3 | 86.6 | 82.8 | 85.3 | 85.3 | 86.2 | 84.9 |
| 1979 | 85.8 | 86.1 | 86.2 | 85.1 | 85.6 | 85.4 | 85.0 | 84.3 | 84.2 | 84.5 | 84.2 | 84.2 | 86.0 | 85.3 | 84.5 | 84.3 | 85.0 |
| 1980 | 84.4 | 84.2 | 83.8 | 81.9 | 79.7 | 78.6 | 77.9 | 77.9 | 79.0 | 79.8 | 81.0 | 81.3 | 84.1 | 80.1 | 78.3 | 80.7 | 80.8 |
| 1981 | 80.6 | 80.0 | 80.3 | 79.7 | 80.1 | 80.3 | 80.6 | 80.4 | 79.8 | 79.0 | 77.9 | 76.9 | 80.3 | 80.0 | 80.3 | 77.9 | 79.6 |
| 1982 | 75.2 | 76.5 | 75.8 | 75.0 | 74.4 | 74.0 | 73.6 | 72.9 | 72.5 | 71.8 | 71.5 | 70.9 | 75.9 | 74.5 | 73.0 | 71.4 | 73.7 |
| 1983 | 72.2 | 71.7 | 72.3 | 73.2 | 73.7 | 74.1 | 75.2 | 76.0 | 77.1 | 77.7 | 77.9 | 78.2 | 72.1 | 73.6 | 76.1 | 77.9 | 74.9 |
| 1984 | 79.7 | 80.0 | 80.2 | 80.6 | 80.9 | 81.0 | 81.1 | 81.0 | 80.6 | 80.4 | 80.5 | 80.4 | 80.0 | 80.8 | 80.9 | 80.4 | 80.5 |
| 1985 | 80.0 | 80.1 | 80.0 | 79.7 | 79.5 | 79.4 | 78.7 | 78.9 | 79.1 | 78.6 | 78.7 | 79.4 | 80.0 | 79.5 | 78.9 | 78.9 | 79.3 |
| 1986 | 79.7 | 79.0 | 78.4 | 78.4 | 78.4 | 78.1 | 78.5 | 78.3 | 78.3 | 78.6 | 78.8 | 79.4 | 79.0 | 78.3 | 78.4 | 78.9 | 78.7 |
| 1987 | 79.0 | 79.9 | 79.9 | 80.2 | 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 | 83.3 | 83.5 | 83.7 | 84.1 | 83.9 | 84.1 | 84.2 | 84.5 | 84.2 | 84.6 | 84.6 | 84.9 | 83.5 | 84.0 | 84.3 | 84.7 | 84.1 |
| 1989 | 85.0 | 84.5 | 84.6 | 84.4 | 83.7 | 83.6 | 82.6 | 83.2 | 82.8 | 82.6 | 82.6 | 83.1 | 84.7 | 83.9 | 82.9 | 82.8 | 83.6 |
| 1990 | 82.5 | 83.0 | 83.2 | 82.9 | 82.9 | 83.0 | 82.7 | 82.8 | 82.8 | 82.1 | 80.9 | 80.3 | 82.9 | 83.0 | 82.8 | 81.1 | 82.4 |
| 1991 | 79.8 | 79.1 | 78.6 | 78.6 | 79.3 | 80.0 | 79.9 | 79.9 | 80.5 | 80.2 | 80.0 | 79.6 | 79.2 | 79.3 | 80.1 | 79.9 | 79.6 |
| 1992 | 79.0 | 79.5 | 80.0 | 80.4 | 80.5 | 80.4 | 80.9 | 80.3 | 80.4 | 80.8 | 80.9 | 80.8 | 79.5 | 80.5 | 80.5 | 80.9 | 80.3 |
| 1993 | 81.1 | 81.2 | 81.1 | 81.3 | 80.9 | 81.1 | 81.2 | 81.1 | 81.4 | 81.8 | 82.0 | 82.3 | 81.2 | 81.1 | 81.2 | 82.1 | 81.4 |
| 1994 | 82.5 | 82.3 | 83.0 | 83.2 | 83.4 | 83.7 | 83.7 | 83.8 | 83.7 | 84.2 | 84.4 | 85.1 | 82.6 | 83.4 | 83.7 | 84.5 | 83.6 |
| 1995 | 85.0 | 84.7 | 84.5 | 84.1 | 84.0 | 83.9 | 83.3 | 84.1 | 84.1 | 83.6 | 83.5 | 83.5 | 84.7 | 84.0 | 83.8 | 83.5 | 84.0 |
| 1996 | 82.6 | 83.6 | 83.1 | 83.3 | 83.4 | 83.7 | 83.2 | 83.4 | 83.4 | 83.0 | 83.4 | 83.5 | 83.1 | 83.5 | 83.3 | 83.3 | 83.3 |
| 1997 | 83.2 | 83.8 | 84.0 | 83.6 | 83.7 | 83.6 | 83.6 | 84.2 | 84.5 | 84.6 | 84.8 | 84.6 | 83.7 | 83.6 | 84.1 | 84.7 | 84.0 |
| 1998 | 84.4 | 83.9 | 83.4 | 83.3 | 83.3 | 82.4 | 81.6 | 82.9 | 82.3 | 82.5 | 82.0 | 82.0 | 83.9 | 83.0 | 82.3 | 82.2 | 82.8 |
| 1999 | 82.0 | 82.0 | 81.8 | 81.7 | 82.0 | 81.6 | 81.8 | 81.9 | 81.3 | 82.0 | 82.2 | 82.6 | 82.0 | 81.8 | 81.6 | 82.3 | 81.9 |
| 2000 | 82.4 | 82.4 | 82.4 | 82.6 | 82.5 | 82.4 | 81.9 | 81.5 | 81.6 | 81.0 | 80.7 | 80.2 | 82.4 | 82.5 | 81.6 | 80.6 | 81.8 |
| 2001 | 79.4 | 78.7 | 78.2 | 77.8 | 77.1 | 76.4 | 75.9 | 75.4 | 74.9 | 74.3 | 73.8 | 73.6 | 78.8 | 77.1 | 75.4 | 73.9 | 76.3 |
| 2002 | 73.8 | 73.8 | 74.2 | 74.4 | 74.7 | 75.4 | 75.1 | 75.2 | 75.2 | 75.0 | 75.4 | 75.1 | 73.9 | 74.8 | 75.2 | 75.2 | 74.8 |
| 2003 | 75.6 | 75.9 | 75.9 | 75.3 | 75.4 | 75.6 | 75.9 | 75.9 | 76.3 | 76.4 | 77.0 | 77.0 | 75.8 | 75.4 | 76.1 | 76.8 | 76.0 |
| 2004 | 77.2 | 77.6 | 77.1 | 77.5 | 78.0 | 77.4 | 77.9 | 78.1 | 78.0 | 78.7 | 79.0 | 79.4 | 77.3 | 77.6 | 78.0 | 79.1 | 78.0 |
| 2005 | 79.8 | 80.2 | 80.1 | 80.0 | 80.2 | 80.5 | 80.4 | 80.5 | 79.0 | 79.8 | 80.6 | 80.9 | 80.0 | 80.3 | 80.0 | 80.4 | 80.2 |
| 2006 | 80.9 | 80.7 | 80.8 | 81.1 | 80.9 | 81.2 | 81.3 | 81.3 | 80.9 | 80.8 | 80.5 | 80.9 | 80.8 | 81.0 | 81.2 | 80.7 | 80.9 |
| 2007 | 80.5 | 80.9 | 80.7 | 81.0 | 80.9 | 81.0 | 81.4 | 81.2 | 81.3 | 80.8 | 81.1 | 81.0 | 80.7 | 81.0 | 81.3 | 81.0 | 81.0 |
| 2008 | 81.0 | 80.4 | |||||||||||||||
Note: Estimates from October 2007 through February 2008 are subject to further revision in the upcoming monthly releases.