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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 | 8.30 | NA |
| 1993 | 7.60 | -8.43% |
| 1994 | 6.30 | -17.11% |
| 1995 | 6.00 | -4.76% |
| 1996 | 6.20 | 3.33% |
| 1997 | 6.20 | 0.00% |
| 1998 | 6.10 | -1.61% |
| 1999 | 6.60 | 8.20% |
| 2000 | 6.90 | 4.55% |
| 2001 | 6.60 | -4.35% |
| 2002 | 7.50 | 13.64% |
| 2003 | 7.60 | 1.33% |
| 2004 | 8.40 | 10.53% |
| 2005 | 9.00 | 7.14% |
| 2006 | 9.70 | 7.78% |
| 2007 | 11.00 | 13.40% |
| 2008 | 11.00 | 0.00% |
| 2009 | 11.00 | 0.00% |
| 2010 | 11.00 | 0.00% |
| 2011 | 11.00 | 0.00% |
| 2012 | 12.00 | 9.09% |
| 2013 | 13.00 | 8.33% |
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