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| year | consumption | change |
| 1980 | .16 | NA |
| 1981 | .41 | 156.25% |
| 1982 | .37 | -9.76% |
| 1983 | .38 | 2.70% |
| 1984 | .35 | -7.89% |
| 1985 | .35 | 0.00% |
| 1986 | .44 | 25.71% |
| 1987 | .49 | 11.36% |
| 1988 | .49 | 0.00% |
| 1989 | .50 | 2.04% |
| 1990 | .53 | 6.00% |
| 1991 | .53 | 0.00% |
| 1992 | .58 | 9.43% |
| 1993 | .55 | -5.17% |
| 1994 | .96 | 74.55% |
| 1995 | 1.01 | 5.21% |
| 1996 | 1.12 | 10.89% |
| 1997 | 1.08 | -3.57% |
| 1998 | 1.13 | 4.63% |
| 1999 | 1.45 | 28.32% |
| 2000 | 1.53 | 5.52% |
| 2001 | 1.44 | -5.88% |
| 2002 | 1.47 | 2.08% |
| 2003 | 1.83 | 24.49% |
| 2004 | 1.91 | 4.37% |
| 2005 | 2.02 | 5.76% |
| 2006 | 2.25 | 11.39% |
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