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Loading...
| year | consumption | change |
| 1980 | .00 | NA |
| 1981 | .00 | NA |
| 1982 | .00 | NA |
| 1983 | .00 | NA |
| 1984 | .00 | NA |
| 1985 | .00 | NA |
| 1986 | .00 | NA |
| 1987 | .00 | NA |
| 1988 | .00 | NA |
| 1989 | .00 | NA |
| 1990 | .00 | NA |
| 1991 | .00 | NA |
| 1992 | .00 | NA |
| 1993 | .00 | NA |
| 1994 | .00 | NA |
| 1995 | .00 | NA |
| 1996 | .00 | NA |
| 1997 | .00 | NA |
| 1998 | 3.60 | NA |
| 1999 | 4.20 | 16.67% |
| 2000 | 4.50 | 7.14% |
| 2001 | 4.50 | 0.00% |
| 2002 | 4.50 | 0.00% |
| 2003 | 4.90 | 8.89% |
| 2004 | 4.90 | 0.00% |
| 2005 | 5.80 | 18.37% |
| 2006 | 4.60 | -20.69% |
| 2007 | 20.00 | 334.78% |
| 2008 | 24.00 | 20.00% |
| 2009 | 26.00 | 8.33% |
| 2010 | 32.00 | 23.08% |
| 2011 | 42.00 | 31.25% |
| 2012 | 41.00 | -2.38% |
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