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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 | 5.30 | NA |
| 1993 | 3.20 | -39.62% |
| 1994 | 3.60 | 12.50% |
| 1995 | 3.20 | -11.11% |
| 1996 | 3.90 | 21.88% |
| 1997 | 4.40 | 12.82% |
| 1998 | 5.50 | 25.00% |
| 1999 | 5.10 | -7.27% |
| 2000 | 7.30 | 43.14% |
| 2001 | 7.40 | 1.37% |
| 2002 | 7.50 | 1.35% |
| 2003 | 7.90 | 5.33% |
| 2004 | 8.30 | 5.06% |
| 2005 | 8.50 | 2.41% |
| 2006 | 8.50 | 0.00% |
| 2007 | 8.50 | 0.00% |
| 2008 | 11.00 | 29.41% |
| 2009 | 10.00 | -9.09% |
| 2010 | 11.00 | 10.00% |
| 2011 | 12.00 | 9.09% |
| 2012 | 12.00 | 0.00% |
| 2013 | 12.00 | 0.00% |
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