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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 | .00 | NA |
| 1993 | 49.00 | NA |
| 1994 | 50.00 | 2.04% |
| 1995 | 53.00 | 6.00% |
| 1996 | 55.00 | 3.77% |
| 1997 | 55.00 | 0.00% |
| 1998 | 54.00 | -1.82% |
| 1999 | 52.00 | -3.70% |
| 2000 | 54.00 | 3.85% |
| 2001 | 55.00 | 1.85% |
| 2002 | 55.00 | 0.00% |
| 2003 | 57.00 | 3.64% |
| 2004 | 58.00 | 1.75% |
| 2005 | 59.00 | 1.72% |
| 2006 | 61.00 | 3.39% |
| 2007 | 61.00 | 0.00% |
| 2008 | 62.00 | 1.64% |
| 2009 | 59.00 | -4.84% |
| 2010 | 61.00 | 3.39% |
| 2011 | 60.00 | -1.64% |
| 2012 | 61.00 | 1.67% |
| 2013 | 60.00 | -1.64% |
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