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| year | consumption | change |
| 1992 | 17.00 | NA |
| 1993 | 17.00 | 0.00% |
| 1994 | 15.00 | -11.76% |
| 1995 | 10.00 | -33.33% |
| 1996 | 11.00 | 10.00% |
| 1997 | 9.80 | -10.91% |
| 1998 | 9.30 | -5.10% |
| 1999 | 8.60 | -7.53% |
| 2000 | 4.80 | -44.19% |
| 2001 | 4.70 | -2.08% |
| 2002 | 4.10 | -12.77% |
| 2003 | 3.60 | -12.20% |
| 2004 | 4.40 | 22.22% |
| 2005 | 3.70 | -15.91% |
| 2006 | 5.10 | 37.84% |
| 2007 | 5.30 | 3.92% |
| 2008 | 5.60 | 5.66% |
| 2009 | 5.10 | -8.93% |
| 2010 | 5.10 | 0.00% |
| 2011 | 4.10 | -19.61% |
| 2012 | 6.90 | 68.29% |
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