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| year | consumption | change |
| 1986 | 6.40 | NA |
| 1987 | 6.30 | -1.56% |
| 1988 | 6.40 | 1.59% |
| 1989 | 6.50 | 1.56% |
| 1990 | 6.60 | 1.54% |
| 1991 | 6.60 | 0.00% |
| 1992 | 6.70 | 1.52% |
| 1993 | 6.60 | -1.49% |
| 1994 | 6.50 | -1.52% |
| 1995 | 6.40 | -1.54% |
| 1996 | 6.50 | 1.56% |
| 1997 | 9.00 | 38.46% |
| 1998 | 10.00 | 11.11% |
| 1999 | 14.00 | 40.00% |
| 2000 | 13.00 | -7.14% |
| 2001 | 15.00 | 15.38% |
| 2002 | 16.00 | 6.67% |
| 2003 | 20.00 | 25.00% |
| 2004 | 19.00 | -5.00% |
| 2005 | 23.00 | 21.05% |
| 2006 | 27.00 | 17.39% |
| 2007 | 33.00 | 22.22% |
| 2008 | 33.00 | 0.00% |
| 2009 | 27.00 | -18.18% |
| 2010 | 51.00 | 88.89% |
| 2011 | 51.00 | 0.00% |
| 2012 | 55.00 | 7.84% |
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