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| year | consumption | change |
| 1992 | 19.00 | NA |
| 1993 | 28.00 | 47.37% |
| 1994 | 4.90 | -82.50% |
| 1995 | 5.30 | 8.16% |
| 1996 | 2.50 | -52.83% |
| 1997 | 2.80 | 12.00% |
| 1998 | 1.10 | -60.71% |
| 1999 | 1.30 | 18.18% |
| 2000 | 1.70 | 30.77% |
| 2001 | 1.30 | -23.53% |
| 2002 | 1.40 | 7.69% |
| 2003 | 1.40 | 0.00% |
| 2004 | 1.40 | 0.00% |
| 2005 | 1.40 | 0.00% |
| 2006 | 1.60 | 14.29% |
| 2007 | 6.60 | 312.50% |
| 2008 | 1.60 | -75.76% |
| 2009 | 1.60 | 0.00% |
| 2010 | .00 | -100.00% |
| 2011 | .00 | NA |
| 2012 | .00 | NA |
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