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| year | consumption | change |
| 1992 | 3.00 | NA |
| 1993 | .40 | -86.67% |
| 1994 | 3.10 | 675.00% |
| 1995 | 1.40 | -54.84% |
| 1996 | 1.00 | -28.57% |
| 1997 | 2.80 | 180.00% |
| 1998 | .90 | -67.86% |
| 1999 | .80 | -11.11% |
| 2000 | 3.00 | 275.00% |
| 2001 | 1.30 | -56.67% |
| 2002 | 1.50 | 15.38% |
| 2003 | 1.70 | 13.33% |
| 2004 | 2.00 | 17.65% |
| 2005 | 2.00 | 0.00% |
| 2006 | 7.40 | 270.00% |
| 2007 | 8.30 | 12.16% |
| 2008 | 7.90 | -4.82% |
| 2009 | 4.10 | -48.10% |
| 2010 | 6.70 | 63.41% |
| 2011 | 5.80 | -13.43% |
| 2012 | 4.80 | -17.24% |
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