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| year | consumption | change |
| 1992 | 22.00 | NA |
| 1993 | 21.00 | -4.55% |
| 1994 | 25.00 | 19.05% |
| 1995 | 16.00 | -36.00% |
| 1996 | 17.00 | 6.25% |
| 1997 | 11.00 | -35.29% |
| 1998 | 18.00 | 63.64% |
| 1999 | 19.00 | 5.56% |
| 2000 | 18.00 | -5.26% |
| 2001 | 10.00 | -44.44% |
| 2002 | 10.00 | 0.00% |
| 2003 | 11.00 | 10.00% |
| 2004 | 11.00 | 0.00% |
| 2005 | 14.00 | 27.27% |
| 2006 | 17.00 | 21.43% |
| 2007 | 19.00 | 11.76% |
| 2008 | 22.00 | 15.79% |
| 2009 | 23.00 | 4.55% |
| 2010 | 25.00 | 8.70% |
| 2011 | 27.00 | 8.00% |
| 2012 | 29.00 | 7.41% |
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