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| year | consumption | change |
| 1992 | 13.00 | NA |
| 1993 | 9.10 | -30.00% |
| 1994 | 6.20 | -31.87% |
| 1995 | 8.90 | 43.55% |
| 1996 | 10.00 | 12.36% |
| 1997 | 11.00 | 10.00% |
| 1998 | 13.00 | 18.18% |
| 1999 | .50 | -96.15% |
| 2000 | 1.10 | 120.00% |
| 2001 | 12.00 | 990.91% |
| 2002 | 12.00 | 0.00% |
| 2003 | 13.00 | 8.33% |
| 2004 | 14.00 | 7.69% |
| 2005 | 15.00 | 7.14% |
| 2006 | 15.00 | 0.00% |
| 2007 | 15.00 | 0.00% |
| 2008 | 4.60 | -69.33% |
| 2009 | 16.00 | 247.83% |
| 2010 | 4.40 | -72.50% |
| 2011 | 3.80 | -13.64% |
| 2012 | 3.20 | -15.79% |
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