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| year | consumption | change |
| 1986 | .50 | NA |
| 1987 | .40 | -20.00% |
| 1988 | .30 | -25.00% |
| 1989 | .30 | 0.00% |
| 1990 | .30 | 0.00% |
| 1991 | .80 | 166.67% |
| 1992 | 1.00 | 25.00% |
| 1993 | 1.00 | 0.00% |
| 1994 | 1.10 | 10.00% |
| 1995 | 1.30 | 18.18% |
| 1996 | 1.40 | 7.69% |
| 1997 | 1.90 | 35.71% |
| 1998 | 2.00 | 5.26% |
| 1999 | .30 | -85.00% |
| 2000 | 2.10 | 600.00% |
| 2001 | 2.10 | 0.00% |
| 2002 | 2.70 | 28.57% |
| 2003 | 4.50 | 66.67% |
| 2004 | 5.30 | 17.78% |
| 2005 | 5.20 | -1.89% |
| 2006 | 5.80 | 11.54% |
| 2007 | 6.50 | 12.07% |
| 2008 | 6.90 | 6.15% |
| 2009 | 7.30 | 5.80% |
| 2010 | 7.40 | 1.37% |
| 2011 | 7.30 | -1.35% |
| 2012 | 7.30 | 0.00% |
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