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| year | consumption | change |
| 1992 | 8.40 | NA |
| 1993 | 9.50 | 13.10% |
| 1994 | 8.70 | -8.42% |
| 1995 | 7.70 | -11.49% |
| 1996 | 8.30 | 7.79% |
| 1997 | 8.40 | 1.20% |
| 1998 | 9.00 | 7.14% |
| 1999 | 8.20 | -8.89% |
| 2000 | 8.40 | 2.44% |
| 2001 | 10.00 | 19.05% |
| 2002 | 12.00 | 20.00% |
| 2003 | 12.00 | 0.00% |
| 2004 | 12.00 | 0.00% |
| 2005 | 13.00 | 8.33% |
| 2006 | 13.00 | 0.00% |
| 2007 | 14.00 | 7.69% |
| 2008 | 13.00 | -7.14% |
| 2009 | 11.00 | -15.38% |
| 2010 | 13.00 | 18.18% |
| 2011 | 14.00 | 7.69% |
| 2012 | 15.00 | 7.14% |
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