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| year | consumption | change |
| 1992 | 8.10 | NA |
| 1993 | 6.50 | -19.75% |
| 1994 | 5.80 | -10.77% |
| 1995 | 5.70 | -1.72% |
| 1996 | 2.70 | -52.63% |
| 1997 | 2.70 | 0.00% |
| 1998 | 3.00 | 11.11% |
| 1999 | 3.10 | 3.33% |
| 2000 | 5.60 | 80.65% |
| 2001 | 5.60 | 0.00% |
| 2002 | 5.90 | 5.36% |
| 2003 | 6.40 | 8.47% |
| 2004 | 7.40 | 15.63% |
| 2005 | 8.00 | 8.11% |
| 2006 | 6.50 | -18.75% |
| 2007 | 7.00 | 7.69% |
| 2008 | 7.40 | 5.71% |
| 2009 | 7.20 | -2.70% |
| 2010 | 6.10 | -15.28% |
| 2011 | 5.30 | -13.11% |
| 2012 | 4.50 | -15.09% |
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