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| year | consumption | change |
| 1992 | 16.00 | NA |
| 1993 | 11.00 | -31.25% |
| 1994 | 11.00 | 0.00% |
| 1995 | 10.00 | -9.09% |
| 1996 | 13.00 | 30.00% |
| 1997 | 7.30 | -43.85% |
| 1998 | 8.20 | 12.33% |
| 1999 | 7.80 | -4.88% |
| 2000 | 13.00 | 66.67% |
| 2001 | 16.00 | 23.08% |
| 2002 | 13.00 | -18.75% |
| 2003 | 14.00 | 7.69% |
| 2004 | 13.00 | -7.14% |
| 2005 | 14.00 | 7.69% |
| 2006 | 16.00 | 14.29% |
| 2007 | 19.00 | 18.75% |
| 2008 | 18.00 | -5.26% |
| 2009 | 15.00 | -16.67% |
| 2010 | 20.00 | 33.33% |
| 2011 | 18.00 | -10.00% |
| 2012 | 19.00 | 5.56% |
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