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| year | consumption | change |
| 1992 | 57.00 | NA |
| 1993 | 50.00 | -12.28% |
| 1994 | 51.00 | 2.00% |
| 1995 | 57.00 | 11.76% |
| 1996 | 37.00 | -35.09% |
| 1997 | 37.00 | 0.00% |
| 1998 | 41.00 | 10.81% |
| 1999 | 39.00 | -4.88% |
| 2000 | 34.00 | -12.82% |
| 2001 | 53.00 | 55.88% |
| 2002 | 34.00 | -35.85% |
| 2003 | 35.00 | 2.94% |
| 2004 | 35.00 | 0.00% |
| 2005 | 34.00 | -2.86% |
| 2006 | 35.00 | 2.94% |
| 2007 | 38.00 | 8.57% |
| 2008 | 23.00 | -39.47% |
| 2009 | 23.00 | 0.00% |
| 2010 | 20.00 | -13.04% |
| 2011 | 19.00 | -5.00% |
| 2012 | 18.00 | -5.26% |
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