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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 | 6.80 | NA |
| 1993 | 5.20 | -23.53% |
| 1994 | 4.90 | -5.77% |
| 1995 | 4.90 | 0.00% |
| 1996 | 4.80 | -2.04% |
| 1997 | 4.90 | 2.08% |
| 1998 | 4.70 | -4.08% |
| 1999 | 4.70 | 0.00% |
| 2000 | 4.90 | 4.26% |
| 2001 | 5.00 | 2.04% |
| 2002 | 5.10 | 2.00% |
| 2003 | 5.60 | 9.80% |
| 2004 | 5.80 | 3.57% |
| 2005 | 6.10 | 5.17% |
| 2006 | 6.40 | 4.92% |
| 2007 | 6.80 | 6.25% |
| 2008 | 6.80 | 0.00% |
| 2009 | 6.30 | -7.35% |
| 2010 | 6.60 | 4.76% |
| 2011 | 6.50 | -1.52% |
| 2012 | 7.10 | 9.23% |
| 2013 | 6.80 | -4.23% |
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