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| year | consumption | change |
| 1992 | 33.00 | NA |
| 1993 | 19.00 | -42.42% |
| 1994 | 8.80 | -53.68% |
| 1995 | 12.00 | 36.36% |
| 1996 | 12.00 | 0.00% |
| 1997 | 10.00 | -16.67% |
| 1998 | 14.00 | 40.00% |
| 1999 | 12.00 | -14.29% |
| 2000 | 11.00 | -8.33% |
| 2001 | 9.20 | -16.36% |
| 2002 | 10.00 | 8.70% |
| 2003 | 9.60 | -4.00% |
| 2004 | 12.00 | 25.00% |
| 2005 | 14.00 | 16.67% |
| 2006 | 14.00 | 0.00% |
| 2007 | 14.00 | 0.00% |
| 2008 | 26.00 | 85.71% |
| 2009 | 34.00 | 30.77% |
| 2010 | 27.00 | -20.59% |
| 2011 | 28.00 | 3.70% |
| 2012 | 36.00 | 28.57% |
| 2013 | 33.00 | -8.33% |
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