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| year | consumption | change |
| 1992 | .20 | NA |
| 1993 | .00 | -100.00% |
| 1994 | .30 | NA |
| 1995 | .40 | 33.33% |
| 1996 | .60 | 50.00% |
| 1997 | .60 | 0.00% |
| 1998 | 1.40 | 133.33% |
| 1999 | 2.40 | 71.43% |
| 2000 | 3.70 | 54.17% |
| 2001 | .30 | -91.89% |
| 2002 | .60 | 100.00% |
| 2003 | .60 | 0.00% |
| 2004 | .50 | -16.67% |
| 2005 | .60 | 20.00% |
| 2006 | .60 | 0.00% |
| 2007 | .60 | 0.00% |
| 2008 | .60 | 0.00% |
| 2009 | .60 | 0.00% |
| 2010 | .60 | 0.00% |
| 2011 | .40 | -33.33% |
| 2012 | .40 | 0.00% |
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