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| year | consumption | change |
| 1992 | 50.00 | NA |
| 1993 | 46.00 | -8.00% |
| 1994 | 37.00 | -19.57% |
| 1995 | 40.00 | 8.11% |
| 1996 | 40.00 | 0.00% |
| 1997 | 38.00 | -5.00% |
| 1998 | 35.00 | -7.89% |
| 1999 | 34.00 | -2.86% |
| 2000 | 33.00 | -2.94% |
| 2001 | 26.00 | -21.21% |
| 2002 | 34.00 | 30.77% |
| 2003 | 37.00 | 8.82% |
| 2004 | 35.00 | -5.41% |
| 2005 | 33.00 | -5.71% |
| 2006 | 30.00 | -9.09% |
| 2007 | 29.00 | -3.33% |
| 2008 | 9.60 | -66.90% |
| 2009 | 10.00 | 4.17% |
| 2010 | 10.00 | 0.00% |
| 2011 | 9.30 | -7.00% |
| 2012 | 6.00 | -35.48% |
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