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| year | consumption | change |
| 1980 | .31 | NA |
| 1981 | .32 | 3.23% |
| 1982 | .51 | 59.38% |
| 1983 | .53 | 3.92% |
| 1984 | .76 | 43.40% |
| 1985 | .88 | 15.79% |
| 1986 | .92 | 4.55% |
| 1987 | .86 | -6.52% |
| 1988 | 1.00 | 16.28% |
| 1989 | 1.05 | 5.00% |
| 1990 | 1.11 | 5.71% |
| 1991 | 1.19 | 7.21% |
| 1992 | 1.30 | 9.24% |
| 1993 | 1.33 | 2.31% |
| 1994 | 1.19 | -10.53% |
| 1995 | 1.81 | 52.10% |
| 1996 | 1.72 | -4.97% |
| 1997 | 1.76 | 2.33% |
| 1998 | 1.86 | 5.68% |
| 1999 | 1.89 | 1.61% |
| 2000 | 1.75 | -7.41% |
| 2001 | 1.98 | 13.14% |
| 2002 | 1.98 | 0.00% |
| 2003 | 2.28 | 15.15% |
| 2004 | 3.11 | 36.40% |
| 2005 | 3.73 | 19.94% |
| 2006 | 4.90 | 31.37% |
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