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| year | consumption | change |
| 1992 | 15.00 | NA |
| 1993 | 11.00 | -26.67% |
| 1994 | 5.30 | -51.82% |
| 1995 | 5.40 | 1.89% |
| 1996 | 8.70 | 61.11% |
| 1997 | 8.50 | -2.30% |
| 1998 | 5.70 | -32.94% |
| 1999 | 3.60 | -36.84% |
| 2000 | 1.50 | -58.33% |
| 2002 | .30 | -80.00% |
| 2003 | .30 | 0.00% |
| 2004 | .40 | 33.33% |
| 2005 | 1.40 | 250.00% |
| 2006 | 1.40 | 0.00% |
| 2007 | 3.70 | 164.29% |
| 2008 | 2.00 | -45.95% |
| 2009 | 4.10 | 105.00% |
| 2010 | 3.20 | -21.95% |
| 2011 | 3.40 | 6.25% |
| 2012 | 4.20 | 23.53% |
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