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| year | consumption | change |
| 1980 | .30 | NA |
| 1981 | .30 | 0.00% |
| 1982 | .34 | 13.33% |
| 1983 | .39 | 14.71% |
| 1984 | .36 | -7.69% |
| 1985 | .52 | 44.44% |
| 1986 | .58 | 11.54% |
| 1987 | .58 | 0.00% |
| 1988 | .62 | 6.90% |
| 1989 | .63 | 1.61% |
| 1990 | .66 | 4.76% |
| 1991 | .77 | 16.67% |
| 1992 | .85 | 10.39% |
| 1993 | .87 | 2.35% |
| 1994 | .94 | 8.05% |
| 1995 | 1.00 | 6.38% |
| 1996 | .98 | -2.00% |
| 1997 | 1.07 | 9.18% |
| 1998 | 1.11 | 3.74% |
| 1999 | 1.37 | 23.42% |
| 2000 | 1.71 | 24.82% |
| 2001 | 1.86 | 8.77% |
| 2002 | 2.08 | 11.83% |
| 2003 | 2.15 | 3.37% |
| 2004 | 2.58 | 20.00% |
| 2005 | 3.64 | 41.09% |
| 2006 | 4.77 | 31.04% |
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