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| year | consumption | change |
| 1980 | .00 | NA |
| 1981 | .00 | NA |
| 1982 | .07 | NA |
| 1983 | .20 | 185.71% |
| 1984 | .21 | 5.00% |
| 1985 | .38 | 80.95% |
| 1986 | .57 | 50.00% |
| 1987 | .71 | 24.56% |
| 1988 | .96 | 35.21% |
| 1989 | .96 | 0.00% |
| 1990 | 1.07 | 11.46% |
| 1991 | 1.00 | -6.54% |
| 1992 | 1.03 | 3.00% |
| 1993 | 1.04 | 0.97% |
| 1994 | 1.52 | 46.15% |
| 1995 | 2.10 | 38.16% |
| 1996 | 2.22 | 5.71% |
| 1997 | 2.63 | 18.47% |
| 1998 | 3.65 | 38.78% |
| 1999 | 3.70 | 1.37% |
| 2000 | 4.63 | 25.14% |
| 2001 | 5.73 | 23.76% |
| 2002 | 5.93 | 3.49% |
| 2003 | 6.00 | 1.18% |
| 2004 | 6.32 | 5.33% |
| 2005 | 6.27 | -0.79% |
| 2006 | 6.33 | 0.96% |
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