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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 | 5.70 | -16.18% |
| 1994 | 5.90 | 3.51% |
| 1995 | 5.60 | -5.08% |
| 1996 | 5.90 | 5.36% |
| 1997 | 6.20 | 5.08% |
| 1998 | 6.10 | -1.61% |
| 1999 | 5.70 | -6.56% |
| 2000 | 5.90 | 3.51% |
| 2001 | 5.80 | -1.69% |
| 2002 | 6.10 | 5.17% |
| 2003 | 6.50 | 6.56% |
| 2004 | 6.80 | 4.62% |
| 2005 | 6.90 | 1.47% |
| 2006 | 7.30 | 5.80% |
| 2007 | 7.70 | 5.48% |
| 2008 | 7.90 | 2.60% |
| 2009 | 7.50 | -5.06% |
| 2010 | 7.90 | 5.33% |
| 2011 | 7.70 | -2.53% |
| 2012 | 8.20 | 6.49% |
| 2013 | 8.00 | -2.44% |
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