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| year | consumption | change |
| 1986 | 6.60 | NA |
| 1987 | 8.70 | 31.82% |
| 1988 | 7.30 | -16.09% |
| 1989 | 6.70 | -8.22% |
| 1990 | 10.00 | 49.25% |
| 1991 | 11.00 | 10.00% |
| 1992 | 11.00 | 0.00% |
| 1993 | 10.00 | -9.09% |
| 1994 | 15.00 | 50.00% |
| 1995 | 15.00 | 0.00% |
| 1996 | 11.00 | -26.67% |
| 1997 | 11.00 | 0.00% |
| 1998 | 17.00 | 54.55% |
| 1999 | 13.00 | -23.53% |
| 2000 | 12.00 | -7.69% |
| 2001 | 11.00 | -8.33% |
| 2002 | 15.00 | 36.36% |
| 2003 | 16.00 | 6.67% |
| 2004 | 18.00 | 12.50% |
| 2005 | 19.00 | 5.56% |
| 2006 | 13.00 | -31.58% |
| 2007 | 19.00 | 46.15% |
| 2008 | 18.00 | -5.26% |
| 2009 | 18.00 | 0.00% |
| 2010 | 18.00 | 0.00% |
| 2011 | 23.00 | 27.78% |
| 2012 | 25.00 | 8.70% |
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