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| year | consumption | change |
| 1992 | 11.00 | NA |
| 1993 | 6.20 | -43.64% |
| 1994 | 4.70 | -24.19% |
| 1995 | 4.60 | -2.13% |
| 1996 | 1.70 | -63.04% |
| 1997 | 1.80 | 5.88% |
| 1998 | 2.00 | 11.11% |
| 1999 | 2.00 | 0.00% |
| 2000 | 2.90 | 45.00% |
| 2001 | 2.90 | 0.00% |
| 2002 | 3.00 | 3.45% |
| 2003 | 3.30 | 10.00% |
| 2004 | 3.40 | 3.03% |
| 2005 | 3.50 | 2.94% |
| 2006 | 4.50 | 28.57% |
| 2007 | 4.50 | 0.00% |
| 2008 | 4.60 | 2.22% |
| 2009 | 4.30 | -6.52% |
| 2010 | 3.80 | -11.63% |
| 2011 | 3.50 | -7.89% |
| 2012 | 3.60 | 2.86% |
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