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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 | 10.00 | NA |
| 1993 | 8.40 | -16.00% |
| 1994 | 7.70 | -8.33% |
| 1995 | 5.50 | -28.57% |
| 1996 | 5.30 | -3.64% |
| 1997 | 5.70 | 7.55% |
| 1998 | 6.70 | 17.54% |
| 1999 | 6.70 | 0.00% |
| 2000 | 6.30 | -5.97% |
| 2001 | 6.20 | -1.59% |
| 2002 | 6.40 | 3.23% |
| 2003 | 6.80 | 6.25% |
| 2004 | 7.00 | 2.94% |
| 2005 | 7.40 | 5.71% |
| 2006 | 6.70 | -9.46% |
| 2007 | 6.90 | 2.99% |
| 2008 | 7.10 | 2.90% |
| 2009 | 6.80 | -4.23% |
| 2010 | 7.60 | 11.76% |
| 2011 | 8.40 | 10.53% |
| 2012 | 8.50 | 1.19% |
| 2013 | 9.10 | 7.06% |
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