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| year | consumption | change |
| 1986 | 2.60 | NA |
| 1987 | 2.60 | 0.00% |
| 1988 | 2.40 | -7.69% |
| 1989 | .80 | -66.67% |
| 1990 | .80 | 0.00% |
| 1991 | .60 | -25.00% |
| 1992 | 5.20 | 766.67% |
| 1993 | 3.90 | -25.00% |
| 1994 | 5.80 | 48.72% |
| 1995 | 6.20 | 6.90% |
| 1996 | 6.20 | 0.00% |
| 1997 | 5.70 | -8.06% |
| 1998 | 6.00 | 5.26% |
| 1999 | 7.30 | 21.67% |
| 2000 | 9.30 | 27.40% |
| 2001 | 7.20 | -22.58% |
| 2002 | 5.80 | -19.44% |
| 2003 | 6.60 | 13.79% |
| 2004 | 7.30 | 10.61% |
| 2005 | 7.20 | -1.37% |
| 2006 | 7.10 | -1.39% |
| 2007 | 6.90 | -2.82% |
| 2008 | 7.00 | 1.45% |
| 2009 | 6.90 | -1.43% |
| 2010 | 7.10 | 2.90% |
| 2011 | .20 | -97.18% |
| 2012 | .20 | 0.00% |
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