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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 | 10.00 | NA |
| 1993 | 9.90 | -1.00% |
| 1994 | 10.00 | 1.01% |
| 1995 | 10.00 | 0.00% |
| 1996 | 10.00 | 0.00% |
| 1997 | 12.00 | 20.00% |
| 1998 | 13.00 | 8.33% |
| 1999 | 12.00 | -7.69% |
| 2000 | 12.00 | 0.00% |
| 2001 | 12.00 | 0.00% |
| 2002 | 13.00 | 8.33% |
| 2003 | 13.00 | 0.00% |
| 2004 | 14.00 | 7.69% |
| 2005 | 14.00 | 0.00% |
| 2006 | 15.00 | 7.14% |
| 2007 | 15.00 | 0.00% |
| 2008 | 16.00 | 6.67% |
| 2009 | 15.00 | -6.25% |
| 2010 | 16.00 | 6.67% |
| 2011 | 16.00 | 0.00% |
| 2012 | 16.00 | 0.00% |
| 2013 | 15.00 | -6.25% |
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