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| year | consumption | change |
| 1986 | .60 | NA |
| 1987 | .60 | 0.00% |
| 1988 | .70 | 16.67% |
| 1989 | .70 | 0.00% |
| 1990 | .70 | 0.00% |
| 1991 | .70 | 0.00% |
| 1992 | .70 | 0.00% |
| 1993 | .70 | 0.00% |
| 1994 | .70 | 0.00% |
| 1995 | .70 | 0.00% |
| 1996 | .80 | 14.29% |
| 1997 | 1.30 | 62.50% |
| 1998 | 1.90 | 46.15% |
| 1999 | 1.80 | -5.26% |
| 2000 | 1.80 | 0.00% |
| 2001 | 2.20 | 22.22% |
| 2002 | 2.50 | 13.64% |
| 2003 | 2.70 | 8.00% |
| 2004 | 2.60 | -3.70% |
| 2005 | 2.80 | 7.69% |
| 2006 | 3.20 | 14.29% |
| 2007 | 5.40 | 68.75% |
| 2008 | 4.60 | -14.81% |
| 2009 | 5.30 | 15.22% |
| 2010 | 4.70 | -11.32% |
| 2011 | 4.80 | 2.13% |
| 2012 | 4.80 | 0.00% |
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