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| year | consumption | change |
| 1986 | 7.50 | NA |
| 1987 | 7.40 | -1.33% |
| 1988 | 3.60 | -51.35% |
| 1989 | 3.70 | 2.78% |
| 1990 | 3.40 | -8.11% |
| 1991 | 3.90 | 14.71% |
| 1992 | 6.10 | 56.41% |
| 1993 | 6.00 | -1.64% |
| 1994 | 6.10 | 1.67% |
| 1995 | 6.80 | 11.48% |
| 1996 | 7.10 | 4.41% |
| 1997 | 6.80 | -4.23% |
| 1998 | 7.00 | 2.94% |
| 1999 | 5.30 | -24.29% |
| 2000 | 7.30 | 37.74% |
| 2001 | 6.70 | -8.22% |
| 2002 | 6.70 | 0.00% |
| 2003 | 11.00 | 64.18% |
| 2004 | 11.00 | 0.00% |
| 2005 | 7.90 | -28.18% |
| 2006 | 26.00 | 229.11% |
| 2007 | 25.00 | -3.85% |
| 2008 | 36.00 | 44.00% |
| 2009 | 22.00 | -38.89% |
| 2010 | 63.00 | 186.36% |
| 2011 | 71.00 | 12.70% |
| 2012 | 41.00 | -42.25% |
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