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| year | consumption | change |
| 1992 | 3.40 | NA |
| 1993 | 4.00 | 17.65% |
| 1994 | 5.00 | 25.00% |
| 1995 | 5.00 | 0.00% |
| 1996 | 6.00 | 20.00% |
| 1997 | 7.20 | 20.00% |
| 1998 | 8.00 | 11.11% |
| 1999 | .50 | -93.75% |
| 2000 | 1.50 | 200.00% |
| 2001 | 10.00 | 566.67% |
| 2002 | 13.00 | 30.00% |
| 2003 | 8.30 | -36.15% |
| 2004 | 9.40 | 13.25% |
| 2005 | 11.00 | 17.02% |
| 2006 | 1.10 | -90.00% |
| 2007 | .90 | -18.18% |
| 2008 | .80 | -11.11% |
| 2009 | .90 | 12.50% |
| 2010 | .80 | -11.11% |
| 2011 | .80 | 0.00% |
| 2012 | .70 | -12.50% |
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