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| year | consumption | change |
| 1993 | 16.00 | NA |
| 1994 | 15.00 | -6.25% |
| 1995 | 10.00 | -33.33% |
| 1996 | 11.00 | 10.00% |
| 1997 | 11.00 | 0.00% |
| 1998 | 11.00 | 0.00% |
| 1999 | 7.10 | -35.45% |
| 2000 | 3.40 | -52.11% |
| 2001 | 7.20 | 111.76% |
| 2002 | 6.70 | -6.94% |
| 2003 | 7.00 | 4.48% |
| 2004 | 5.30 | -24.29% |
| 2005 | 6.20 | 16.98% |
| 2006 | 7.40 | 19.35% |
| 2007 | 6.40 | -13.51% |
| 2008 | 6.00 | -6.25% |
| 2009 | 5.70 | -5.00% |
| 2010 | 6.40 | 12.28% |
| 2011 | 5.70 | -10.94% |
| 2012 | 6.20 | 8.77% |
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