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| year | consumption | change |
| 1986 | 4.60 | NA |
| 1987 | 4.50 | -2.17% |
| 1988 | 4.50 | 0.00% |
| 1989 | 4.50 | 0.00% |
| 1990 | 4.40 | -2.22% |
| 1991 | 4.20 | -4.55% |
| 1992 | 4.70 | 11.90% |
| 1993 | 4.60 | -2.13% |
| 1994 | 5.30 | 15.22% |
| 1995 | 6.20 | 16.98% |
| 1996 | 6.00 | -3.23% |
| 1997 | 7.60 | 26.67% |
| 1998 | 8.50 | 11.84% |
| 1999 | 8.20 | -3.53% |
| 2000 | 7.80 | -4.88% |
| 2001 | 7.90 | 1.28% |
| 2002 | 7.20 | -8.86% |
| 2003 | 6.80 | -5.56% |
| 2004 | 8.10 | 19.12% |
| 2005 | 8.60 | 6.17% |
| 2006 | 8.40 | -2.33% |
| 2007 | 9.50 | 13.10% |
| 2008 | 8.40 | -11.58% |
| 2009 | 8.50 | 1.19% |
| 2010 | 8.00 | -5.88% |
| 2011 | 9.50 | 18.75% |
| 2012 | 9.50 | 0.00% |
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