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| year | consumption | change |
| 1992 | 4.00 | NA |
| 1993 | 4.60 | 15.00% |
| 1994 | 6.00 | 30.43% |
| 1995 | 5.30 | -11.67% |
| 1996 | 7.10 | 33.96% |
| 1997 | 5.20 | -26.76% |
| 1998 | 3.70 | -28.85% |
| 1999 | 4.20 | 13.51% |
| 2000 | 3.40 | -19.05% |
| 2001 | 3.10 | -8.82% |
| 2002 | 3.50 | 12.90% |
| 2003 | 2.90 | -17.14% |
| 2004 | 2.80 | -3.45% |
| 2005 | 2.80 | 0.00% |
| 2006 | 2.60 | -7.14% |
| 2007 | 2.70 | 3.85% |
| 2008 | 2.80 | 3.70% |
| 2009 | 2.80 | 0.00% |
| 2010 | 2.90 | 3.57% |
| 2011 | 3.10 | 6.90% |
| 2012 | 2.60 | -16.13% |
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