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| year | consumption | change |
| 1992 | 16.00 | NA |
| 1993 | 11.00 | -31.25% |
| 1994 | 10.00 | -9.09% |
| 1995 | 15.00 | 50.00% |
| 1996 | 15.00 | 0.00% |
| 1997 | 15.00 | 0.00% |
| 1998 | 15.00 | 0.00% |
| 1999 | 12.00 | -20.00% |
| 2000 | 15.00 | 25.00% |
| 2001 | 23.00 | 53.33% |
| 2002 | 17.00 | -26.09% |
| 2003 | 7.20 | -57.65% |
| 2004 | 6.40 | -11.11% |
| 2005 | 9.00 | 40.63% |
| 2006 | 10.00 | 11.11% |
| 2007 | 9.50 | -5.00% |
| 2008 | 8.00 | -15.79% |
| 2009 | 6.20 | -22.50% |
| 2010 | 4.60 | -25.81% |
| 2011 | 3.90 | -15.22% |
| 2012 | 3.30 | -15.38% |
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