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| year | consumption | change |
| 1986 | .70 | NA |
| 1987 | .70 | 0.00% |
| 1988 | .90 | 28.57% |
| 1989 | 1.50 | 66.67% |
| 1990 | .80 | -46.67% |
| 1991 | .80 | 0.00% |
| 1992 | 6.10 | 662.50% |
| 1993 | 6.10 | 0.00% |
| 1994 | 6.20 | 1.64% |
| 1995 | 6.20 | 0.00% |
| 1996 | 6.20 | 0.00% |
| 1997 | 6.30 | 1.61% |
| 1998 | 6.30 | 0.00% |
| 1999 | 6.30 | 0.00% |
| 2000 | 6.40 | 1.59% |
| 2001 | 6.40 | 0.00% |
| 2002 | 6.40 | 0.00% |
| 2003 | 6.40 | 0.00% |
| 2004 | 6.50 | 1.56% |
| 2005 | 6.60 | 1.54% |
| 2006 | 5.00 | -24.24% |
| 2007 | 4.70 | -6.00% |
| 2008 | .50 | -89.36% |
| 2009 | .50 | 0.00% |
| 2010 | .50 | 0.00% |
| 2011 | .50 | 0.00% |
| 2012 | .50 | 0.00% |
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