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| year | consumption | change |
| 1992 | 12.00 | NA |
| 1993 | 11.00 | -8.33% |
| 1994 | 7.60 | -30.91% |
| 1995 | 7.80 | 2.63% |
| 1996 | 6.60 | -15.38% |
| 1997 | 6.40 | -3.03% |
| 1998 | 5.10 | -20.31% |
| 1999 | 3.60 | -29.41% |
| 2000 | 8.70 | 141.67% |
| 2001 | 13.00 | 49.43% |
| 2002 | 14.00 | 7.69% |
| 2003 | 5.90 | -57.86% |
| 2004 | 6.70 | 13.56% |
| 2005 | 6.80 | 1.49% |
| 2006 | 6.80 | 0.00% |
| 2007 | 7.10 | 4.41% |
| 2008 | 7.50 | 5.63% |
| 2009 | 6.80 | -9.33% |
| 2010 | 8.60 | 26.47% |
| 2011 | 9.10 | 5.81% |
| 2012 | 8.20 | -9.89% |
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