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| year | consumption | change |
| 1992 | 6.90 | NA |
| 1993 | 7.80 | 13.04% |
| 1994 | 9.20 | 17.95% |
| 1995 | 7.00 | -23.91% |
| 1996 | 7.90 | 12.86% |
| 1997 | 6.60 | -16.46% |
| 1998 | 6.60 | 0.00% |
| 1999 | 5.40 | -18.18% |
| 2000 | 6.40 | 18.52% |
| 2001 | 4.50 | -29.69% |
| 2002 | 5.60 | 24.44% |
| 2003 | 4.40 | -21.43% |
| 2004 | 4.40 | 0.00% |
| 2005 | 4.60 | 4.55% |
| 2006 | 5.30 | 15.22% |
| 2007 | 5.90 | 11.32% |
| 2008 | 4.60 | -22.03% |
| 2009 | 5.10 | 10.87% |
| 2010 | 4.10 | -19.61% |
| 2011 | 3.50 | -14.63% |
| 2012 | 3.60 | 2.86% |
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