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| year | consumption | change |
| 1980 | .05 | NA |
| 1981 | .02 | -60.00% |
| 1982 | .02 | 0.00% |
| 1983 | .04 | 100.00% |
| 1984 | .04 | 0.00% |
| 1985 | .04 | 0.00% |
| 1986 | .04 | 0.00% |
| 1987 | .05 | 25.00% |
| 1988 | .05 | 0.00% |
| 1989 | .05 | 0.00% |
| 1990 | .03 | -40.00% |
| 1991 | .07 | 133.33% |
| 1992 | .07 | 0.00% |
| 1993 | .08 | 14.29% |
| 1994 | .06 | -25.00% |
| 1995 | .07 | 16.67% |
| 1996 | .07 | 0.00% |
| 1997 | .08 | 14.29% |
| 1998 | .05 | -37.50% |
| 1999 | .06 | 20.00% |
| 2000 | .06 | 0.00% |
| 2001 | .07 | 16.67% |
| 2002 | .08 | 14.29% |
| 2003 | .10 | 25.00% |
| 2004 | .10 | 0.00% |
| 2005 | .16 | 60.00% |
| 2006 | .16 | 0.00% |
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