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| year | consumption | change |
| 1992 | 1.30 | NA |
| 1993 | 1.20 | -7.69% |
| 1994 | .50 | -58.33% |
| 1995 | .60 | 20.00% |
| 1996 | .60 | 0.00% |
| 1997 | .50 | -16.67% |
| 1998 | .80 | 60.00% |
| 1999 | 1.00 | 25.00% |
| 2000 | .90 | -10.00% |
| 2001 | .70 | -22.22% |
| 2002 | 1.00 | 42.86% |
| 2003 | 1.20 | 20.00% |
| 2004 | 1.30 | 8.33% |
| 2005 | 1.50 | 15.38% |
| 2006 | 1.70 | 13.33% |
| 2007 | 2.00 | 17.65% |
| 2008 | 2.10 | 5.00% |
| 2009 | 2.00 | -4.76% |
| 2010 | 2.00 | 0.00% |
| 2011 | 1.80 | -10.00% |
| 2012 | 1.70 | -5.56% |
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