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| year | consumption | change |
| 1986 | 1.50 | NA |
| 1987 | 1.50 | 0.00% |
| 1988 | .80 | -46.67% |
| 1989 | .90 | 12.50% |
| 1990 | 1.10 | 22.22% |
| 1991 | 1.10 | 0.00% |
| 1992 | 1.10 | 0.00% |
| 1993 | 1.30 | 18.18% |
| 1994 | .90 | -30.77% |
| 1995 | .90 | 0.00% |
| 1996 | 1.10 | 22.22% |
| 1997 | 1.20 | 9.09% |
| 1998 | 1.30 | 8.33% |
| 1999 | 1.30 | 0.00% |
| 2000 | 1.50 | 15.38% |
| 2001 | 1.50 | 0.00% |
| 2002 | 1.50 | 0.00% |
| 2003 | 1.50 | 0.00% |
| 2004 | 1.50 | 0.00% |
| 2005 | 1.50 | 0.00% |
| 2006 | 2.10 | 40.00% |
| 2007 | 1.70 | -19.05% |
| 2008 | 1.70 | 0.00% |
| 2009 | 2.40 | 41.18% |
| 2010 | 2.20 | -8.33% |
| 2011 | 2.40 | 9.09% |
| 2012 | 2.30 | -4.17% |
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