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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 | 11.00 | NA |
| 1993 | 9.00 | -18.18% |
| 1994 | 8.40 | -6.67% |
| 1995 | 8.40 | 0.00% |
| 1996 | 8.40 | 0.00% |
| 1997 | 8.30 | -1.19% |
| 1998 | 8.60 | 3.61% |
| 1999 | 8.20 | -4.65% |
| 2000 | 8.30 | 1.22% |
| 2001 | 8.00 | -3.61% |
| 2002 | 8.20 | 2.50% |
| 2003 | 8.50 | 3.66% |
| 2004 | 9.00 | 5.88% |
| 2005 | 8.90 | -1.11% |
| 2006 | 9.30 | 4.49% |
| 2007 | 9.60 | 3.23% |
| 2008 | 10.00 | 4.17% |
| 2009 | 9.20 | -8.00% |
| 2010 | 9.20 | 0.00% |
| 2011 | 9.30 | 1.09% |
| 2012 | 9.70 | 4.30% |
| 2013 | 9.50 | -2.06% |
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