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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 | 5.50 | NA |
| 1993 | 4.90 | -10.91% |
| 1994 | 5.00 | 2.04% |
| 1995 | 5.10 | 2.00% |
| 1996 | 5.50 | 7.84% |
| 1997 | 5.60 | 1.82% |
| 1998 | 5.80 | 3.57% |
| 1999 | 5.40 | -6.90% |
| 2000 | 5.50 | 1.85% |
| 2001 | 5.30 | -3.64% |
| 2002 | 5.30 | 0.00% |
| 2003 | 6.00 | 13.21% |
| 2004 | 6.10 | 1.67% |
| 2005 | 6.60 | 8.20% |
| 2006 | 6.80 | 3.03% |
| 2007 | 7.10 | 4.41% |
| 2008 | 7.30 | 2.82% |
| 2009 | 6.70 | -8.22% |
| 2010 | 7.10 | 5.97% |
| 2011 | 7.80 | 9.86% |
| 2012 | 7.40 | -5.13% |
| 2013 | 7.40 | 0.00% |
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