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| year | consumption | change |
| 1986 | 8.20 | NA |
| 1987 | 8.40 | 2.44% |
| 1988 | 7.90 | -5.95% |
| 1989 | 8.10 | 2.53% |
| 1990 | 8.40 | 3.70% |
| 1991 | 10.00 | 19.05% |
| 1992 | 9.80 | -2.00% |
| 1993 | 9.50 | -3.06% |
| 1994 | 11.00 | 15.79% |
| 1995 | 11.00 | 0.00% |
| 1996 | 12.00 | 9.09% |
| 1997 | 12.00 | 0.00% |
| 1998 | 12.00 | 0.00% |
| 1999 | 13.00 | 8.33% |
| 2000 | 14.00 | 7.69% |
| 2001 | 15.00 | 7.14% |
| 2002 | 15.00 | 0.00% |
| 2003 | 16.00 | 6.67% |
| 2004 | 16.00 | 0.00% |
| 2005 | 16.00 | 0.00% |
| 2006 | 17.00 | 6.25% |
| 2007 | 22.00 | 29.41% |
| 2008 | 21.00 | -4.55% |
| 2009 | 24.00 | 14.29% |
| 2010 | 25.00 | 4.17% |
| 2011 | 26.00 | 4.00% |
| 2012 | 26.00 | 0.00% |
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