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| year | consumption | change |
| 1986 | .30 | NA |
| 1987 | .30 | 0.00% |
| 1988 | .40 | 33.33% |
| 1989 | .40 | 0.00% |
| 1990 | .40 | 0.00% |
| 1991 | .40 | 0.00% |
| 1992 | .40 | 0.00% |
| 1993 | .50 | 25.00% |
| 1995 | .40 | -20.00% |
| 1996 | 1.80 | 350.00% |
| 1997 | 1.80 | 0.00% |
| 1998 | 2.00 | 11.11% |
| 1999 | 2.00 | 0.00% |
| 2000 | 2.70 | 35.00% |
| 2001 | 2.80 | 3.70% |
| 2002 | 3.40 | 21.43% |
| 2003 | 5.90 | 73.53% |
| 2004 | 4.10 | -30.51% |
| 2005 | 3.10 | -24.39% |
| 2006 | 4.40 | 41.94% |
| 2007 | 5.10 | 15.91% |
| 2008 | 5.20 | 1.96% |
| 2009 | 5.70 | 9.62% |
| 2010 | 5.70 | 0.00% |
| 2011 | 5.70 | 0.00% |
| 2012 | 5.70 | 0.00% |
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