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| year | consumption | change |
| 1992 | 32.00 | NA |
| 1993 | 34.00 | 6.25% |
| 1994 | 32.00 | -5.88% |
| 1995 | 25.00 | -21.88% |
| 1996 | 27.00 | 8.00% |
| 1997 | 27.00 | 0.00% |
| 1998 | 27.00 | 0.00% |
| 1999 | 25.00 | -7.41% |
| 2000 | 21.00 | -16.00% |
| 2001 | 24.00 | 14.29% |
| 2002 | 25.00 | 4.17% |
| 2003 | 24.00 | -4.00% |
| 2004 | 25.00 | 4.17% |
| 2005 | 26.00 | 4.00% |
| 2006 | 28.00 | 7.69% |
| 2007 | 30.00 | 7.14% |
| 2008 | 28.00 | -6.67% |
| 2009 | 26.00 | -7.14% |
| 2010 | 26.00 | 0.00% |
| 2011 | 26.00 | 0.00% |
| 2012 | 29.00 | 11.54% |
| 2013 | 30.00 | 3.45% |
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