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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 | 8.50 | NA |
| 1993 | 8.20 | -3.53% |
| 1994 | 8.10 | -1.22% |
| 1995 | 8.00 | -1.23% |
| 1996 | 6.90 | -13.75% |
| 1997 | 6.70 | -2.90% |
| 1998 | 7.00 | 4.48% |
| 1999 | 8.60 | 22.86% |
| 2000 | 9.10 | 5.81% |
| 2001 | 8.10 | -10.99% |
| 2002 | 7.70 | -4.94% |
| 2003 | 9.60 | 24.68% |
| 2004 | 8.10 | -15.63% |
| 2005 | 6.80 | -16.05% |
| 2006 | 7.10 | 4.41% |
| 2007 | 7.60 | 7.04% |
| 2008 | 7.10 | -6.58% |
| 2009 | 7.00 | -1.41% |
| 2010 | 7.30 | 4.29% |
| 2011 | 8.90 | 21.92% |
| 2012 | 9.90 | 11.24% |
| 2013 | 11.00 | 11.11% |
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