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| year | consumption | change |
| 1980 | .00 | NA |
| 1981 | .00 | NA |
| 1982 | .00 | NA |
| 1983 | .02 | NA |
| 1984 | .04 | 100.00% |
| 1985 | .06 | 50.00% |
| 1986 | .14 | 133.33% |
| 1987 | .18 | 28.57% |
| 1988 | .30 | 66.67% |
| 1989 | .44 | 46.67% |
| 1990 | .80 | 81.82% |
| 1991 | 1.04 | 30.00% |
| 1992 | 1.36 | 30.77% |
| 1993 | 1.67 | 22.79% |
| 1994 | 1.85 | 10.78% |
| 1995 | 1.98 | 7.03% |
| 1996 | 2.28 | 15.15% |
| 1997 | 3.13 | 37.28% |
| 1998 | 4.08 | 30.35% |
| 1999 | 4.59 | 12.50% |
| 2000 | 5.79 | 26.14% |
| 2001 | 6.09 | 5.18% |
| 2002 | 7.01 | 15.11% |
| 2003 | 8.29 | 18.26% |
| 2004 | 9.64 | 16.28% |
| 2005 | 10.15 | 5.29% |
| 2006 | 9.53 | -6.11% |
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