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| year | consumption | change |
| 1992 | 39.00 | NA |
| 1993 | 41.00 | 5.13% |
| 1994 | 45.00 | 9.76% |
| 1995 | 41.00 | -8.89% |
| 1996 | 30.00 | -26.83% |
| 1997 | 26.00 | -13.33% |
| 1998 | 30.00 | 15.38% |
| 1999 | 18.00 | -40.00% |
| 2000 | 16.00 | -11.11% |
| 2001 | 24.00 | 50.00% |
| 2002 | 13.00 | -45.83% |
| 2003 | 11.00 | -15.38% |
| 2004 | 11.00 | 0.00% |
| 2005 | 13.00 | 18.18% |
| 2006 | 9.80 | -24.62% |
| 2007 | 12.00 | 22.45% |
| 2008 | 7.90 | -34.17% |
| 2009 | 11.00 | 39.24% |
| 2010 | 9.80 | -10.91% |
| 2011 | 8.30 | -15.31% |
| 2012 | 9.50 | 14.46% |
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