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| year | consumption | change |
| 1992 | 9.40 | NA |
| 1993 | 5.20 | -44.68% |
| 1994 | 5.00 | -3.85% |
| 1995 | 6.00 | 20.00% |
| 1996 | 5.10 | -15.00% |
| 1997 | 5.80 | 13.73% |
| 1998 | 4.90 | -15.52% |
| 1999 | 2.70 | -44.90% |
| 2000 | 5.60 | 107.41% |
| 2001 | 8.80 | 57.14% |
| 2002 | 9.30 | 5.68% |
| 2003 | 4.50 | -51.61% |
| 2004 | 4.90 | 8.89% |
| 2005 | 5.10 | 4.08% |
| 2006 | 4.70 | -7.84% |
| 2007 | 5.90 | 25.53% |
| 2008 | 4.90 | -16.95% |
| 2009 | 4.90 | 0.00% |
| 2010 | 4.70 | -4.08% |
| 2011 | 4.90 | 4.26% |
| 2012 | 3.90 | -20.41% |
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