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| year | consumption | change |
| 1980 | 1.09 | NA |
| 1981 | .85 | -22.02% |
| 1982 | 9.71 | 1,042.35% |
| 1983 | 10.86 | 11.84% |
| 1984 | 11.97 | 10.22% |
| 1985 | 12.58 | 5.10% |
| 1986 | 13.73 | 9.14% |
| 1987 | 14.69 | 6.99% |
| 1988 | 15.93 | 8.44% |
| 1989 | 16.98 | 6.59% |
| 1990 | 12.69 | -25.27% |
| 1991 | 13.14 | 3.55% |
| 1992 | 13.34 | 1.52% |
| 1993 | 13.14 | -1.50% |
| 1994 | 14.09 | 7.23% |
| 1995 | 16.22 | 15.12% |
| 1996 | 17.39 | 7.21% |
| 1997 | 18.78 | 7.99% |
| 1998 | 18.29 | -2.61% |
| 1999 | 18.76 | 2.57% |
| 2000 | 18.47 | -1.55% |
| 2001 | 18.82 | 1.89% |
| 2002 | 20.55 | 9.19% |
| 2003 | 21.10 | 2.68% |
| 2004 | 21.73 | 2.99% |
| 2005 | 23.55 | 8.38% |
| 2006 | 25.86 | 9.81% |
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