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| year | consumption | change |
| 1992 | 11.00 | NA |
| 1993 | 12.00 | 9.09% |
| 1994 | 9.10 | -24.17% |
| 1995 | 9.30 | 2.20% |
| 1996 | 10.00 | 7.53% |
| 1997 | 10.00 | 0.00% |
| 1998 | 12.00 | 20.00% |
| 1999 | 11.00 | -8.33% |
| 2000 | 11.00 | 0.00% |
| 2001 | 18.00 | 63.64% |
| 2002 | 18.00 | 0.00% |
| 2003 | 18.00 | 0.00% |
| 2004 | 17.00 | -5.56% |
| 2005 | 18.00 | 5.88% |
| 2006 | 21.00 | 16.67% |
| 2007 | 27.00 | 28.57% |
| 2008 | 21.00 | -22.22% |
| 2009 | 19.00 | -9.52% |
| 2010 | 28.00 | 47.37% |
| 2011 | 28.00 | 0.00% |
| 2012 | 27.00 | -3.57% |
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