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| year | consumption | change |
| 1992 | 22.00 | NA |
| 1993 | 23.00 | 4.55% |
| 1994 | 25.00 | 8.70% |
| 1995 | 28.00 | 12.00% |
| 1996 | 25.00 | -10.71% |
| 1997 | 27.00 | 8.00% |
| 1998 | 29.00 | 7.41% |
| 1999 | 30.00 | 3.45% |
| 2000 | 20.00 | -33.33% |
| 2001 | 22.00 | 10.00% |
| 2002 | 25.00 | 13.64% |
| 2003 | 26.00 | 4.00% |
| 2004 | 18.00 | -30.77% |
| 2005 | 19.00 | 5.56% |
| 2006 | 20.00 | 5.26% |
| 2007 | 19.00 | -5.00% |
| 2008 | 15.00 | -21.05% |
| 2009 | 17.00 | 13.33% |
| 2010 | 9.90 | -41.76% |
| 2011 | 9.60 | -3.03% |
| 2012 | 7.20 | -25.00% |
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