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| year | consumption | change |
| 1986 | 6.10 | NA |
| 1987 | 6.10 | 0.00% |
| 1988 | 6.30 | 3.28% |
| 1989 | 7.90 | 25.40% |
| 1990 | 7.20 | -8.86% |
| 1991 | 6.80 | -5.56% |
| 1992 | 6.10 | -10.29% |
| 1993 | 5.80 | -4.92% |
| 1994 | 6.00 | 3.45% |
| 1995 | 4.30 | -28.33% |
| 1996 | 4.40 | 2.33% |
| 1997 | 4.20 | -4.55% |
| 1998 | 4.80 | 14.29% |
| 1999 | 5.00 | 4.17% |
| 2000 | 4.50 | -10.00% |
| 2001 | 5.50 | 22.22% |
| 2002 | 5.80 | 5.45% |
| 2003 | 5.70 | -1.72% |
| 2004 | 6.30 | 10.53% |
| 2005 | 6.00 | -4.76% |
| 2006 | 6.50 | 8.33% |
| 2007 | 6.70 | 3.08% |
| 2008 | 8.60 | 28.36% |
| 2009 | 7.50 | -12.79% |
| 2010 | 6.70 | -10.67% |
| 2011 | 7.60 | 13.43% |
| 2012 | 9.10 | 19.74% |
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