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| year | consumption | change |
| 1986 | .40 | NA |
| 1987 | .50 | 25.00% |
| 1988 | .40 | -20.00% |
| 1989 | .50 | 25.00% |
| 1990 | .40 | -20.00% |
| 1991 | .40 | 0.00% |
| 1992 | .50 | 25.00% |
| 1993 | .60 | 20.00% |
| 1994 | .80 | 33.33% |
| 1995 | .80 | 0.00% |
| 1996 | 1.40 | 75.00% |
| 1997 | .90 | -35.71% |
| 1998 | 1.00 | 11.11% |
| 1999 | 1.20 | 20.00% |
| 2000 | 1.30 | 8.33% |
| 2001 | 1.50 | 15.38% |
| 2002 | 1.70 | 13.33% |
| 2003 | 1.70 | 0.00% |
| 2004 | 1.60 | -5.88% |
| 2005 | 2.50 | 56.25% |
| 2006 | 3.30 | 32.00% |
| 2007 | 2.90 | -12.12% |
| 2008 | 2.50 | -13.79% |
| 2009 | 1.80 | -28.00% |
| 2010 | 2.40 | 33.33% |
| 2011 | 2.70 | 12.50% |
| 2012 | 3.30 | 22.22% |
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