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| year | consumption | change |
| 1991 | .60 | NA |
| 1992 | .50 | -16.67% |
| 1993 | .50 | 0.00% |
| 1994 | .50 | 0.00% |
| 1995 | .60 | 20.00% |
| 1996 | .60 | 0.00% |
| 1997 | .40 | -33.33% |
| 1998 | .60 | 50.00% |
| 1999 | .70 | 16.67% |
| 2000 | .40 | -42.86% |
| 2001 | .50 | 25.00% |
| 2002 | .50 | 0.00% |
| 2003 | .40 | -20.00% |
| 2004 | .30 | -25.00% |
| 2005 | .30 | 0.00% |
| 2006 | .30 | 0.00% |
| 2007 | .30 | 0.00% |
| 2008 | .40 | 33.33% |
| 2009 | .20 | -50.00% |
| 2010 | .50 | 150.00% |
| 2011 | .40 | -20.00% |
| 2012 | .20 | -50.00% |
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