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| year | consumption | change |
| 1992 | 19.00 | NA |
| 1993 | 15.00 | -21.05% |
| 1994 | 14.00 | -6.67% |
| 1995 | 19.00 | 35.71% |
| 1996 | 21.00 | 10.53% |
| 1997 | 16.00 | -23.81% |
| 1998 | 14.00 | -12.50% |
| 1999 | 7.60 | -45.71% |
| 2000 | 8.10 | 6.58% |
| 2001 | 8.60 | 6.17% |
| 2002 | 4.20 | -51.16% |
| 2003 | 4.00 | -4.76% |
| 2004 | 2.00 | -50.00% |
| 2005 | 1.10 | -45.00% |
| 2006 | 3.40 | 209.09% |
| 2007 | 3.00 | -11.76% |
| 2008 | 3.10 | 3.33% |
| 2009 | 4.60 | 48.39% |
| 2010 | 3.90 | -15.22% |
| 2011 | 2.90 | -25.64% |
| 2012 | 3.10 | 6.90% |
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