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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 | .60 | NA |
| 1991 | .50 | -16.67% |
| 1992 | .30 | -40.00% |
| 1993 | .80 | 166.67% |
| 1994 | .60 | -25.00% |
| 1995 | 1.70 | 183.33% |
| 1996 | 1.70 | 0.00% |
| 1997 | 1.70 | 0.00% |
| 1998 | 1.30 | -23.53% |
| 1999 | 1.70 | 30.77% |
| 2000 | 1.80 | 5.88% |
| 2001 | 1.90 | 5.56% |
| 2002 | 2.50 | 31.58% |
| 2003 | 2.60 | 4.00% |
| 2004 | 3.00 | 15.38% |
| 2005 | 3.00 | 0.00% |
| 2006 | 3.20 | 6.67% |
| 2007 | 3.20 | 0.00% |
| 2008 | 3.40 | 6.25% |
| 2009 | 3.30 | -2.94% |
| 2010 | 3.20 | -3.03% |
| 2011 | 3.50 | 9.38% |
| 2012 | 3.60 | 2.86% |
| 2013 | 3.80 | 5.56% |
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