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| year | consumption | change |
| 1992 | .70 | NA |
| 1996 | .50 | -28.57% |
| 1997 | 1.30 | 160.00% |
| 1998 | 1.10 | -15.38% |
| 1999 | 3.10 | 181.82% |
| 2000 | 3.10 | 0.00% |
| 2001 | .60 | -80.65% |
| 2002 | .80 | 33.33% |
| 2003 | .50 | -37.50% |
| 2004 | .50 | 0.00% |
| 2005 | .80 | 60.00% |
| 2006 | .90 | 12.50% |
| 2007 | 1.20 | 33.33% |
| 2008 | 1.50 | 25.00% |
| 2009 | 1.50 | 0.00% |
| 2010 | 1.50 | 0.00% |
| 2011 | .70 | -53.33% |
| 2012 | .60 | -14.29% |
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