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| year | consumption | change |
| 1992 | 84.00 | NA |
| 1993 | 76.00 | -9.52% |
| 1994 | 78.00 | 2.63% |
| 1995 | 73.00 | -6.41% |
| 1996 | 66.00 | -9.59% |
| 1997 | 67.00 | 1.52% |
| 1998 | 71.00 | 5.97% |
| 1999 | 62.00 | -12.68% |
| 2000 | 57.00 | -8.06% |
| 2001 | 55.00 | -3.51% |
| 2002 | 53.00 | -3.64% |
| 2003 | 52.00 | -1.89% |
| 2004 | 55.00 | 5.77% |
| 2005 | 68.00 | 23.64% |
| 2006 | 73.00 | 7.35% |
| 2007 | 74.00 | 1.37% |
| 2008 | 68.00 | -8.11% |
| 2009 | 57.00 | -16.18% |
| 2010 | 55.00 | -3.51% |
| 2011 | 55.00 | 0.00% |
| 2012 | 56.00 | 1.82% |
| 2013 | 55.00 | -1.79% |
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