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| year | consumption | change |
| 1986 | .70 | NA |
| 1987 | .60 | -14.29% |
| 1988 | .70 | 16.67% |
| 1989 | .80 | 14.29% |
| 1990 | .80 | 0.00% |
| 1991 | .80 | 0.00% |
| 1992 | .80 | 0.00% |
| 1993 | 1.00 | 25.00% |
| 1994 | 1.00 | 0.00% |
| 1995 | 1.00 | 0.00% |
| 1996 | 1.20 | 20.00% |
| 1997 | 2.20 | 83.33% |
| 1998 | 2.50 | 13.64% |
| 1999 | 2.50 | 0.00% |
| 2000 | 1.60 | -36.00% |
| 2001 | 1.20 | -25.00% |
| 2002 | 2.30 | 91.67% |
| 2003 | 2.50 | 8.70% |
| 2004 | 2.50 | 0.00% |
| 2005 | 2.20 | -12.00% |
| 2006 | 3.30 | 50.00% |
| 2007 | 3.30 | 0.00% |
| 2008 | 5.70 | 72.73% |
| 2009 | 5.70 | 0.00% |
| 2010 | 4.20 | -26.32% |
| 2011 | 3.10 | -26.19% |
| 2012 | 3.40 | 9.68% |
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