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| year | consumption | change |
| 1980 | .13 | NA |
| 1981 | .11 | -15.38% |
| 1982 | .00 | -100.00% |
| 1983 | .00 | NA |
| 1984 | .02 | NA |
| 1985 | .00 | -80.00% |
| 1986 | .04 | 900.00% |
| 1987 | .05 | 25.00% |
| 1988 | .06 | 20.00% |
| 1989 | .06 | 0.00% |
| 1990 | .08 | 33.33% |
| 1991 | .11 | 37.50% |
| 1992 | .11 | 0.00% |
| 1993 | .13 | 18.18% |
| 1994 | .12 | -7.69% |
| 1995 | .29 | 141.67% |
| 1996 | .25 | -13.79% |
| 1997 | .36 | 44.00% |
| 1998 | .33 | -8.33% |
| 1999 | .29 | -12.12% |
| 2000 | .31 | 6.90% |
| 2001 | .32 | 3.23% |
| 2002 | .31 | -3.13% |
| 2003 | .25 | -19.35% |
| 2004 | .24 | -4.00% |
| 2005 | .26 | 8.33% |
| 2006 | .36 | 38.46% |
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