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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 | .00 | NA |
| 1999 | .00 | NA |
| 2000 | 2.90 | NA |
| 2001 | 3.00 | 3.45% |
| 2002 | 3.20 | 6.67% |
| 2003 | 3.30 | 3.13% |
| 2004 | 3.50 | 6.06% |
| 2005 | 3.70 | 5.71% |
| 2006 | 4.10 | 10.81% |
| 2007 | 4.50 | 9.76% |
| 2008 | 5.00 | 11.11% |
| 2009 | 1.70 | -66.00% |
| 2010 | .90 | -47.06% |
| 2011 | 6.30 | 600.00% |
| 2012 | 5.30 | -15.87% |
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