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| year | consumption | change |
| 1992 | 8.60 | NA |
| 1993 | 7.60 | -11.63% |
| 1994 | 3.70 | -51.32% |
| 1995 | 5.00 | 35.14% |
| 1996 | 4.10 | -18.00% |
| 1997 | 2.70 | -34.15% |
| 1998 | 5.30 | 96.30% |
| 1999 | 5.40 | 1.89% |
| 2000 | 4.40 | -18.52% |
| 2001 | 4.40 | 0.00% |
| 2002 | 4.00 | -9.09% |
| 2003 | 5.20 | 30.00% |
| 2004 | 6.90 | 32.69% |
| 2005 | 6.60 | -4.35% |
| 2006 | 5.40 | -18.18% |
| 2007 | 5.90 | 9.26% |
| 2008 | 11.00 | 86.44% |
| 2009 | 6.30 | -42.73% |
| 2010 | 10.00 | 58.73% |
| 2011 | 14.00 | 40.00% |
| 2012 | 21.00 | 50.00% |
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