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| year | consumption | change |
| 1992 | 12.00 | NA |
| 1993 | 11.00 | -8.33% |
| 1994 | 10.00 | -9.09% |
| 1995 | 10.00 | 0.00% |
| 1996 | 10.00 | 0.00% |
| 1997 | 8.40 | -16.00% |
| 1998 | 8.10 | -3.57% |
| 1999 | 4.50 | -44.44% |
| 2000 | 14.00 | 211.11% |
| 2001 | 13.00 | -7.14% |
| 2002 | 6.70 | -48.46% |
| 2003 | 7.40 | 10.45% |
| 2004 | 8.00 | 8.11% |
| 2005 | 8.30 | 3.75% |
| 2006 | 9.20 | 10.84% |
| 2007 | 9.70 | 5.43% |
| 2008 | 8.90 | -8.25% |
| 2009 | 7.30 | -17.98% |
| 2010 | 6.30 | -13.70% |
| 2011 | 6.30 | 0.00% |
| 2012 | 5.10 | -19.05% |
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