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| year | consumption | change |
| 1986 | 9.20 | NA |
| 1987 | 8.30 | -9.78% |
| 1988 | 8.30 | 0.00% |
| 1989 | 8.60 | 3.61% |
| 1990 | 9.20 | 6.98% |
| 1991 | 10.00 | 8.70% |
| 1992 | 13.00 | 30.00% |
| 1993 | 14.00 | 7.69% |
| 1994 | 15.00 | 7.14% |
| 1995 | 15.00 | 0.00% |
| 1996 | 16.00 | 6.67% |
| 1997 | 17.00 | 6.25% |
| 1998 | 18.00 | 5.88% |
| 1999 | 18.00 | 0.00% |
| 2000 | 14.00 | -22.22% |
| 2001 | 13.00 | -7.14% |
| 2002 | 13.00 | 0.00% |
| 2003 | 13.00 | 0.00% |
| 2004 | 14.00 | 7.69% |
| 2005 | 13.00 | -7.14% |
| 2006 | 13.00 | 0.00% |
| 2007 | 13.00 | 0.00% |
| 2008 | 13.00 | 0.00% |
| 2009 | 10.00 | -23.08% |
| 2010 | 8.80 | -12.00% |
| 2011 | 9.10 | 3.41% |
| 2012 | 9.00 | -1.10% |
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