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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 | 9.30 | NA |
| 1993 | 6.10 | -34.41% |
| 1994 | 6.80 | 11.48% |
| 1995 | 6.10 | -10.29% |
| 1996 | 5.80 | -4.92% |
| 1997 | 5.50 | -5.17% |
| 1998 | 5.40 | -1.82% |
| 1999 | 4.10 | -24.07% |
| 2000 | 5.60 | 36.59% |
| 2001 | 5.40 | -3.57% |
| 2002 | 6.10 | 12.96% |
| 2003 | 7.10 | 16.39% |
| 2004 | 7.00 | -1.41% |
| 2005 | 7.00 | 0.00% |
| 2006 | 7.40 | 5.71% |
| 2007 | 6.80 | -8.11% |
| 2008 | 6.90 | 1.47% |
| 2009 | 5.90 | -14.49% |
| 2010 | 5.80 | -1.69% |
| 2011 | 4.90 | -15.52% |
| 2012 | 5.10 | 4.08% |
| 2013 | 5.80 | 13.73% |
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