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| year | consumption | change |
| 1986 | 2.60 | NA |
| 1987 | 6.20 | 138.46% |
| 1988 | 6.10 | -1.61% |
| 1989 | 6.40 | 4.92% |
| 1990 | 5.80 | -9.38% |
| 1991 | 5.80 | 0.00% |
| 1992 | 5.90 | 1.72% |
| 1993 | 6.10 | 3.39% |
| 1994 | 6.20 | 1.64% |
| 1995 | 5.70 | -8.06% |
| 1996 | 5.70 | 0.00% |
| 1997 | 7.70 | 35.09% |
| 1998 | 7.10 | -7.79% |
| 1999 | 8.10 | 14.08% |
| 2000 | 7.30 | -9.88% |
| 2001 | 8.00 | 9.59% |
| 2002 | 7.20 | -10.00% |
| 2003 | 7.90 | 9.72% |
| 2004 | 8.60 | 8.86% |
| 2005 | 9.00 | 4.65% |
| 2006 | 9.20 | 2.22% |
| 2007 | 8.60 | -6.52% |
| 2008 | 7.20 | -16.28% |
| 2009 | 10.00 | 38.89% |
| 2010 | 12.00 | 20.00% |
| 2011 | 12.00 | 0.00% |
| 2012 | 9.70 | -19.17% |
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