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| year | consumption | change |
| 1992 | 4.80 | NA |
| 1993 | 4.00 | -16.67% |
| 1994 | 2.80 | -30.00% |
| 1995 | 3.10 | 10.71% |
| 1996 | 7.00 | 125.81% |
| 1997 | 7.00 | 0.00% |
| 1998 | 6.60 | -5.71% |
| 1999 | 10.00 | 51.52% |
| 2000 | 11.00 | 10.00% |
| 2001 | 7.70 | -30.00% |
| 2002 | 7.70 | 0.00% |
| 2003 | 7.60 | -1.30% |
| 2004 | 6.80 | -10.53% |
| 2005 | 7.30 | 7.35% |
| 2006 | 7.20 | -1.37% |
| 2007 | 7.40 | 2.78% |
| 2008 | 8.20 | 10.81% |
| 2009 | 8.20 | 0.00% |
| 2010 | 8.50 | 3.66% |
| 2011 | 9.30 | 9.41% |
| 2012 | 9.90 | 6.45% |
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