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| year | consumption | change |
| 1986 | .80 | NA |
| 1987 | .50 | -37.50% |
| 1988 | .50 | 0.00% |
| 1989 | .30 | -40.00% |
| 1990 | .50 | 66.67% |
| 1991 | .40 | -20.00% |
| 1992 | .50 | 25.00% |
| 1993 | 9.00 | 1,700.00% |
| 1994 | 9.50 | 5.56% |
| 1995 | 11.00 | 15.79% |
| 1996 | 12.00 | 9.09% |
| 1997 | 11.00 | -8.33% |
| 1998 | 12.00 | 9.09% |
| 1999 | 15.00 | 25.00% |
| 2000 | 13.00 | -13.33% |
| 2001 | 13.00 | 0.00% |
| 2002 | 13.00 | 0.00% |
| 2003 | 15.00 | 15.38% |
| 2004 | 16.00 | 6.67% |
| 2005 | 16.00 | 0.00% |
| 2006 | 18.00 | 12.50% |
| 2007 | 23.00 | 27.78% |
| 2008 | 25.00 | 8.70% |
| 2009 | 22.00 | -12.00% |
| 2010 | 23.00 | 4.55% |
| 2011 | 25.00 | 8.70% |
| 2012 | 28.00 | 12.00% |
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