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| year | consumption | change |
| 1993 | 17.00 | NA |
| 1994 | 17.00 | 0.00% |
| 1995 | 19.00 | 11.76% |
| 1996 | 18.00 | -5.26% |
| 1997 | 18.00 | 0.00% |
| 1998 | 18.00 | 0.00% |
| 1999 | 18.00 | 0.00% |
| 2000 | 17.00 | -5.56% |
| 2001 | 18.00 | 5.88% |
| 2002 | 21.00 | 16.67% |
| 2003 | 19.00 | -9.52% |
| 2004 | 20.00 | 5.26% |
| 2005 | 23.00 | 15.00% |
| 2006 | 24.00 | 4.35% |
| 2007 | 27.00 | 12.50% |
| 2008 | 30.00 | 11.11% |
| 2009 | 26.00 | -13.33% |
| 2010 | 32.00 | 23.08% |
| 2011 | 32.00 | 0.00% |
| 2012 | 31.00 | -3.13% |
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