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| year | consumption | change |
| 1992 | 13.00 | NA |
| 1993 | 16.00 | 23.08% |
| 1994 | 18.00 | 12.50% |
| 1995 | 19.00 | 5.56% |
| 1996 | 21.00 | 10.53% |
| 1997 | 21.00 | 0.00% |
| 1998 | 18.00 | -14.29% |
| 1999 | 18.00 | 0.00% |
| 2000 | 19.00 | 5.56% |
| 2001 | 19.00 | 0.00% |
| 2002 | 18.00 | -5.26% |
| 2003 | 17.00 | -5.56% |
| 2004 | 15.00 | -11.76% |
| 2005 | 15.00 | 0.00% |
| 2006 | 15.00 | 0.00% |
| 2007 | 14.00 | -6.67% |
| 2008 | 15.00 | 7.14% |
| 2009 | 14.00 | -6.67% |
| 2010 | 13.00 | -7.14% |
| 2011 | 13.00 | 0.00% |
| 2012 | 12.00 | -7.69% |
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