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| year | consumption | change |
| 1986 | .00 | NA |
| 1987 | .80 | NA |
| 1988 | 1.90 | 137.50% |
| 1989 | .90 | -52.63% |
| 1990 | 2.00 | 122.22% |
| 1991 | 1.80 | -10.00% |
| 1992 | 2.20 | 22.22% |
| 1993 | 2.20 | 0.00% |
| 1994 | 1.50 | -31.82% |
| 1995 | 1.50 | 0.00% |
| 1996 | 1.50 | 0.00% |
| 1997 | 1.60 | 6.67% |
| 1998 | 1.60 | 0.00% |
| 1999 | 1.60 | 0.00% |
| 2000 | 1.70 | 6.25% |
| 2001 | 2.50 | 47.06% |
| 2002 | 2.60 | 4.00% |
| 2003 | 2.80 | 7.69% |
| 2004 | 3.00 | 7.14% |
| 2005 | 3.20 | 6.67% |
| 2006 | 3.40 | 6.25% |
| 2007 | 3.60 | 5.88% |
| 2008 | 3.90 | 8.33% |
| 2009 | 4.20 | 7.69% |
| 2010 | 4.40 | 4.76% |
| 2011 | 1.40 | -68.18% |
| 2012 | 1.40 | 0.00% |
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