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| year | consumption | change |
| 1992 | 57.00 | NA |
| 1993 | 40.00 | -29.82% |
| 1994 | 22.00 | -45.00% |
| 1995 | 22.00 | 0.00% |
| 1996 | 20.00 | -9.09% |
| 1997 | 18.00 | -10.00% |
| 1998 | 15.00 | -16.67% |
| 1999 | 9.80 | -34.67% |
| 2000 | 9.60 | -2.04% |
| 2001 | 11.00 | 14.58% |
| 2002 | 12.00 | 9.09% |
| 2003 | 13.00 | 8.33% |
| 2004 | 14.00 | 7.69% |
| 2005 | 15.00 | 7.14% |
| 2006 | 15.00 | 0.00% |
| 2007 | 16.00 | 6.67% |
| 2008 | 16.00 | 0.00% |
| 2009 | 14.00 | -12.50% |
| 2010 | 17.00 | 21.43% |
| 2011 | 17.00 | 0.00% |
| 2012 | 16.00 | -5.88% |
| 2013 | 16.00 | 0.00% |
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