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| year | consumption | change |
| 1986 | 4.10 | NA |
| 1987 | 4.50 | 9.76% |
| 1988 | 4.50 | 0.00% |
| 1989 | 4.60 | 2.22% |
| 1990 | 5.20 | 13.04% |
| 1991 | 6.00 | 15.38% |
| 1992 | 6.30 | 5.00% |
| 1993 | 6.80 | 7.94% |
| 1994 | 7.60 | 11.76% |
| 1995 | 8.20 | 7.89% |
| 1996 | 9.10 | 10.98% |
| 1997 | 9.90 | 8.79% |
| 1998 | 9.60 | -3.03% |
| 1999 | 10.00 | 4.17% |
| 2000 | 8.00 | -20.00% |
| 2001 | 8.90 | 11.25% |
| 2002 | 10.00 | 12.36% |
| 2003 | 10.00 | 0.00% |
| 2004 | 10.00 | 0.00% |
| 2005 | 11.00 | 10.00% |
| 2006 | 11.00 | 0.00% |
| 2007 | 10.00 | -9.09% |
| 2008 | 23.00 | 130.00% |
| 2009 | 24.00 | 4.35% |
| 2010 | 33.00 | 37.50% |
| 2011 | 28.00 | -15.15% |
| 2012 | 29.00 | 3.57% |
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