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| year | consumption | change |
| 1986 | .80 | NA |
| 1987 | .80 | 0.00% |
| 1988 | .90 | 12.50% |
| 1989 | .90 | 0.00% |
| 1990 | 1.00 | 11.11% |
| 1991 | 1.40 | 40.00% |
| 1992 | 1.30 | -7.14% |
| 1993 | .30 | -76.92% |
| 1994 | 1.40 | 366.67% |
| 1995 | 1.20 | -14.29% |
| 1996 | 1.10 | -8.33% |
| 1997 | .90 | -18.18% |
| 1998 | 2.20 | 144.44% |
| 1999 | 2.20 | 0.00% |
| 2000 | 1.30 | -40.91% |
| 2001 | 2.10 | 61.54% |
| 2002 | 1.60 | -23.81% |
| 2003 | 1.60 | 0.00% |
| 2004 | 1.40 | -12.50% |
| 2005 | 2.50 | 78.57% |
| 2006 | 3.40 | 36.00% |
| 2007 | 4.70 | 38.24% |
| 2008 | 4.70 | 0.00% |
| 2009 | 12.00 | 155.32% |
| 2010 | 2.80 | -76.67% |
| 2011 | 3.30 | 17.86% |
| 2012 | 3.40 | 3.03% |
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