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| year | consumption | change |
| 1986 | 13.00 | NA |
| 1987 | 12.00 | -7.69% |
| 1988 | 13.00 | 8.33% |
| 1989 | 13.00 | 0.00% |
| 1990 | 12.00 | -7.69% |
| 1991 | 11.00 | -8.33% |
| 1992 | 11.00 | 0.00% |
| 1993 | 11.00 | 0.00% |
| 1994 | 9.30 | -15.45% |
| 1995 | 9.50 | 2.15% |
| 1996 | 9.00 | -5.26% |
| 1997 | 9.10 | 1.11% |
| 1998 | 7.90 | -13.19% |
| 1999 | 7.90 | 0.00% |
| 2000 | 8.00 | 1.27% |
| 2001 | 6.40 | -20.00% |
| 2002 | 6.60 | 3.13% |
| 2003 | 7.30 | 10.61% |
| 2004 | 7.90 | 8.22% |
| 2005 | 6.70 | -15.19% |
| 2006 | 4.50 | -32.84% |
| 2007 | 5.30 | 17.78% |
| 2008 | 4.90 | -7.55% |
| 2009 | 5.10 | 4.08% |
| 2010 | 5.70 | 11.76% |
| 2011 | 5.60 | -1.75% |
| 2012 | 5.80 | 3.57% |
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