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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 | 6.40 | NA |
| 1993 | 3.70 | -42.19% |
| 1994 | 3.30 | -10.81% |
| 1995 | 2.90 | -12.12% |
| 1996 | 3.50 | 20.69% |
| 1997 | 4.30 | 22.86% |
| 1998 | 3.70 | -13.95% |
| 1999 | 3.90 | 5.41% |
| 2000 | 3.70 | -5.13% |
| 2001 | 3.70 | 0.00% |
| 2002 | 3.40 | -8.11% |
| 2003 | 3.70 | 8.82% |
| 2004 | 4.20 | 13.51% |
| 2005 | 4.20 | 0.00% |
| 2006 | 4.40 | 4.76% |
| 2007 | 4.80 | 9.09% |
| 2008 | 4.60 | -4.17% |
| 2009 | 4.50 | -2.17% |
| 2010 | 4.60 | 2.22% |
| 2011 | 5.10 | 10.87% |
| 2012 | 5.00 | -1.96% |
| 2013 | 5.30 | 6.00% |
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