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| year | consumption | change |
| 1980 | .04 | NA |
| 1981 | .14 | 250.00% |
| 1982 | .16 | 14.29% |
| 1983 | .14 | -12.50% |
| 1984 | .14 | 0.00% |
| 1985 | .10 | -28.57% |
| 1986 | .11 | 10.00% |
| 1987 | .10 | -9.09% |
| 1988 | .13 | 30.00% |
| 1989 | .07 | -46.15% |
| 1990 | .05 | -28.57% |
| 1991 | .07 | 40.00% |
| 1992 | .04 | -42.86% |
| 1993 | .02 | -50.00% |
| 1994 | .03 | 50.00% |
| 1995 | .01 | -66.67% |
| 1996 | .02 | 100.00% |
| 1997 | .02 | 0.00% |
| 1998 | .02 | 0.00% |
| 1999 | .03 | 50.00% |
| 2000 | .02 | -33.33% |
| 2001 | .02 | 0.00% |
| 2002 | .02 | 0.00% |
| 2003 | .02 | 0.00% |
| 2004 | .02 | 0.00% |
| 2005 | .02 | 0.00% |
| 2006 | .08 | 300.00% |
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