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| year | consumption | change |
| 1986 | 7.30 | NA |
| 1987 | 8.20 | 12.33% |
| 1988 | 5.00 | -39.02% |
| 1989 | 5.30 | 6.00% |
| 1990 | 8.00 | 50.94% |
| 1991 | 5.70 | -28.75% |
| 1992 | 3.70 | -35.09% |
| 1993 | 4.20 | 13.51% |
| 1994 | 7.10 | 69.05% |
| 1995 | 11.00 | 54.93% |
| 1996 | 11.00 | 0.00% |
| 1997 | 9.90 | -10.00% |
| 1998 | 14.00 | 41.41% |
| 1999 | 11.00 | -21.43% |
| 2000 | 5.60 | -49.09% |
| 2001 | 4.00 | -28.57% |
| 2002 | 3.70 | -7.50% |
| 2003 | 7.70 | 108.11% |
| 2004 | 7.50 | -2.60% |
| 2005 | 11.00 | 46.67% |
| 2006 | 8.20 | -25.45% |
| 2007 | 8.20 | 0.00% |
| 2008 | 8.20 | 0.00% |
| 2009 | 8.80 | 7.32% |
| 2010 | 8.80 | 0.00% |
| 2011 | 8.80 | 0.00% |
| 2012 | 8.70 | -1.14% |
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