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Loading...
| year | consumption | change |
| 1980 | | NA |
| 1981 | | NA |
| 1982 | | NA |
| 1983 | | NA |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | | NA |
| 1993 | .27 | NA |
| 1994 | .39 | 44.44% |
| 1995 | .40 | 2.56% |
| 1996 | .37 | -7.50% |
| 1997 | .50 | 35.14% |
| 1998 | .57 | 14.00% |
| 1999 | .79 | 38.60% |
| 2000 | .69 | -12.66% |
| 2001 | .68 | -1.45% |
| 2002 | .66 | -2.94% |
| 2003 | .48 | -27.27% |
| 2004 | .69 | 43.75% |
| 2005 | .72 | 4.35% |
| 2006 | .93 | 29.17% |
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