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| year | consumption | change |
| 1980 | .29 | NA |
| 1981 | .05 | -82.76% |
| 1982 | .06 | 20.00% |
| 1983 | .06 | 0.00% |
| 1984 | .06 | 0.00% |
| 1985 | .06 | 0.00% |
| 1986 | .06 | 0.00% |
| 1987 | .07 | 16.67% |
| 1988 | .08 | 14.29% |
| 1989 | .09 | 12.50% |
| 1990 | .33 | 266.67% |
| 1991 | .38 | 15.15% |
| 1992 | .42 | 10.53% |
| 1993 | .43 | 2.38% |
| 1994 | .45 | 4.65% |
| 1995 | .52 | 15.56% |
| 1996 | .51 | -1.92% |
| 1997 | .61 | 19.61% |
| 1998 | .64 | 4.92% |
| 1999 | .81 | 26.56% |
| 2000 | .81 | 0.00% |
| 2001 | .81 | 0.00% |
| 2002 | .81 | 0.00% |
| 2003 | .81 | 0.00% |
| 2004 | .83 | 2.47% |
| 2005 | .85 | 2.41% |
| 2006 | .95 | 11.76% |
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