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| year | consumption | change |
| 1992 | 117.00 | NA |
| 1993 | 95.00 | -18.80% |
| 1994 | 82.00 | -13.68% |
| 1995 | 80.00 | -2.44% |
| 1996 | 67.00 | -16.25% |
| 1997 | 58.00 | -13.43% |
| 1998 | 46.00 | -20.69% |
| 1999 | 38.00 | -17.39% |
| 2000 | 46.00 | 21.05% |
| 2001 | 44.00 | -4.35% |
| 2002 | 37.00 | -15.91% |
| 2003 | 38.00 | 2.70% |
| 2004 | 40.00 | 5.26% |
| 2005 | 50.00 | 25.00% |
| 2006 | 51.00 | 2.00% |
| 2007 | 48.00 | -5.88% |
| 2008 | 38.00 | -20.83% |
| 2009 | 23.00 | -39.47% |
| 2010 | 27.00 | 17.39% |
| 2011 | 30.00 | 11.11% |
| 2012 | 30.00 | 0.00% |
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