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| year | consumption | change |
| 1992 | 35.00 | NA |
| 1993 | 23.00 | -34.29% |
| 1994 | 20.00 | -13.04% |
| 1995 | 19.00 | -5.00% |
| 1996 | 18.00 | -5.26% |
| 1997 | 18.00 | 0.00% |
| 1998 | 21.00 | 16.67% |
| 1999 | 21.00 | 0.00% |
| 2000 | 19.00 | -9.52% |
| 2001 | 19.00 | 0.00% |
| 2002 | 20.00 | 5.26% |
| 2003 | 22.00 | 10.00% |
| 2004 | 25.00 | 13.64% |
| 2005 | 26.00 | 4.00% |
| 2006 | 26.00 | 0.00% |
| 2007 | 26.00 | 0.00% |
| 2008 | 30.00 | 15.38% |
| 2009 | 34.00 | 13.33% |
| 2010 | 35.00 | 2.94% |
| 2011 | 35.00 | 0.00% |
| 2012 | 33.00 | -5.71% |
| 2013 | 34.00 | 3.03% |
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