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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 | 43.00 | NA |
| 1993 | 42.00 | -2.33% |
| 1994 | 41.00 | -2.38% |
| 1995 | 39.00 | -4.88% |
| 1996 | 40.00 | 2.56% |
| 1997 | 40.00 | 0.00% |
| 1998 | 40.00 | 0.00% |
| 1999 | 40.00 | 0.00% |
| 2000 | 41.00 | 2.50% |
| 2001 | 41.00 | 0.00% |
| 2002 | 42.00 | 2.44% |
| 2003 | 42.00 | 0.00% |
| 2004 | 43.00 | 2.38% |
| 2005 | 42.00 | -2.33% |
| 2006 | 44.00 | 4.76% |
| 2007 | 42.00 | -4.55% |
| 2008 | 43.00 | 2.38% |
| 2009 | 43.00 | 0.00% |
| 2010 | 45.00 | 4.65% |
| 2011 | 45.00 | 0.00% |
| 2012 | 45.00 | 0.00% |
| 2013 | 47.00 | 4.44% |
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