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| year | consumption | change |
| 1980 | .87 | NA |
| 1981 | .91 | 4.60% |
| 1982 | 1.28 | 40.66% |
| 1983 | 1.35 | 5.47% |
| 1984 | 1.42 | 5.19% |
| 1985 | 1.64 | 15.49% |
| 1986 | 3.40 | 107.32% |
| 1987 | 4.33 | 27.35% |
| 1988 | 4.66 | 7.62% |
| 1989 | 4.68 | 0.43% |
| 1990 | 4.87 | 4.06% |
| 1991 | 5.17 | 6.16% |
| 1992 | 5.52 | 6.77% |
| 1993 | 5.59 | 1.27% |
| 1994 | 5.33 | -4.65% |
| 1995 | 5.40 | 1.31% |
| 1996 | 5.45 | 0.93% |
| 1997 | 5.20 | -4.59% |
| 1998 | 5.67 | 9.04% |
| 1999 | 5.84 | 3.00% |
| 2000 | 6.05 | 3.60% |
| 2001 | 5.79 | -4.30% |
| 2002 | 5.60 | -3.28% |
| 2003 | 8.32 | 48.57% |
| 2004 | 8.66 | 4.09% |
| 2005 | 9.88 | 14.09% |
| 2006 | 8.75 | -11.44% |
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