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| year | consumption | change |
| 1986 | .90 | NA |
| 1987 | .30 | -66.67% |
| 1988 | .00 | -100.00% |
| 1989 | .00 | NA |
| 1990 | .00 | NA |
| 1991 | .80 | NA |
| 1992 | .30 | -62.50% |
| 1993 | .30 | 0.00% |
| 1994 | .00 | -100.00% |
| 1995 | .00 | NA |
| 1996 | .00 | NA |
| 1997 | .00 | NA |
| 1998 | 3.40 | NA |
| 1999 | 3.20 | -5.88% |
| 2000 | 3.40 | 6.25% |
| 2001 | 3.60 | 5.88% |
| 2002 | 3.90 | 8.33% |
| 2003 | 4.60 | 17.95% |
| 2004 | 4.70 | 2.17% |
| 2005 | 4.60 | -2.13% |
| 2006 | 5.10 | 10.87% |
| 2007 | 3.50 | -31.37% |
| 2008 | 5.80 | 65.71% |
| 2009 | 6.30 | 8.62% |
| 2010 | 5.10 | -19.05% |
| 2011 | 5.00 | -1.96% |
| 2012 | 5.10 | 2.00% |
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