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| year | consumption | change |
| 1986 | 7.30 | NA |
| 1987 | 8.00 | 9.59% |
| 1988 | 7.60 | -5.00% |
| 1989 | 8.70 | 14.47% |
| 1990 | 7.20 | -17.24% |
| 1991 | 5.90 | -18.06% |
| 1992 | 8.40 | 42.37% |
| 1993 | 8.60 | 2.38% |
| 1994 | 4.60 | -46.51% |
| 1995 | 6.20 | 34.78% |
| 1996 | 6.30 | 1.61% |
| 1997 | 6.30 | 0.00% |
| 1998 | 6.30 | 0.00% |
| 1999 | 11.00 | 74.60% |
| 2000 | 11.00 | 0.00% |
| 2001 | 12.00 | 9.09% |
| 2002 | 13.00 | 8.33% |
| 2003 | 14.00 | 7.69% |
| 2004 | 15.00 | 7.14% |
| 2005 | 15.00 | 0.00% |
| 2006 | 18.00 | 20.00% |
| 2007 | 23.00 | 27.78% |
| 2008 | 30.00 | 30.43% |
| 2009 | 27.00 | -10.00% |
| 2010 | 24.00 | -11.11% |
| 2011 | 25.00 | 4.17% |
| 2012 | 27.00 | 8.00% |
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