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| year | consumption | change |
| 1992 | 27.00 | NA |
| 1993 | 16.00 | -40.74% |
| 1994 | 7.50 | -53.13% |
| 1995 | 8.00 | 6.67% |
| 1996 | 14.00 | 75.00% |
| 1997 | 16.00 | 14.29% |
| 1998 | 16.00 | 0.00% |
| 1999 | 17.00 | 6.25% |
| 2000 | 16.00 | -5.88% |
| 2001 | 13.00 | -18.75% |
| 2002 | 12.00 | -7.69% |
| 2003 | 12.00 | 0.00% |
| 2004 | 13.00 | 8.33% |
| 2005 | 15.00 | 15.38% |
| 2006 | 16.00 | 6.67% |
| 2007 | 18.00 | 12.50% |
| 2008 | 19.00 | 5.56% |
| 2009 | 20.00 | 5.26% |
| 2010 | 21.00 | 5.00% |
| 2011 | 22.00 | 4.76% |
| 2012 | 22.00 | 0.00% |
| 2013 | 21.00 | -4.55% |
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