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| year | consumption | change |
| 1986 | .00 | NA |
| 1987 | .00 | NA |
| 1988 | .00 | NA |
| 1989 | .00 | NA |
| 1990 | .00 | NA |
| 1991 | .00 | NA |
| 1992 | .00 | NA |
| 1993 | .00 | NA |
| 1994 | .00 | NA |
| 1995 | 1.40 | NA |
| 1996 | 1.70 | 21.43% |
| 1997 | 1.70 | 0.00% |
| 1998 | 3.10 | 82.35% |
| 1999 | 3.80 | 22.58% |
| 2000 | 5.10 | 34.21% |
| 2001 | 5.80 | 13.73% |
| 2002 | 6.00 | 3.45% |
| 2003 | 6.30 | 5.00% |
| 2004 | 7.20 | 14.29% |
| 2005 | 7.40 | 2.78% |
| 2006 | 9.40 | 27.03% |
| 2007 | 9.50 | 1.06% |
| 2008 | 9.70 | 2.11% |
| 2009 | 9.90 | 2.06% |
| 2010 | 1.40 | -85.86% |
| 2011 | 3.30 | 135.71% |
| 2012 | 3.50 | 6.06% |
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