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| year | consumption | change |
| 1992 | 67.00 | NA |
| 1993 | 49.00 | -26.87% |
| 1994 | 58.00 | 18.37% |
| 1995 | 29.00 | -50.00% |
| 1996 | 43.00 | 48.28% |
| 1997 | 40.00 | -6.98% |
| 1998 | 40.00 | 0.00% |
| 1999 | 41.00 | 2.50% |
| 2000 | 44.00 | 7.32% |
| 2001 | 46.00 | 4.55% |
| 2002 | 42.00 | -8.70% |
| 2003 | 48.00 | 14.29% |
| 2004 | 49.00 | 2.08% |
| 2005 | 51.00 | 4.08% |
| 2006 | 45.00 | -11.76% |
| 2007 | 23.00 | -48.89% |
| 2008 | 15.00 | -34.78% |
| 2009 | 8.00 | -46.67% |
| 2010 | 8.00 | 0.00% |
| 2011 | 7.00 | -12.50% |
| 2012 | 7.20 | 2.86% |
| 2013 | 7.50 | 4.17% |
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