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| year | consumption | change |
| 1986 | 6.40 | NA |
| 1987 | 7.10 | 10.94% |
| 1988 | 7.20 | 1.41% |
| 1989 | 6.70 | -6.94% |
| 1990 | 7.30 | 8.96% |
| 1991 | 6.90 | -5.48% |
| 1992 | 6.90 | 0.00% |
| 1993 | 7.60 | 10.14% |
| 1994 | 8.40 | 10.53% |
| 1995 | 9.40 | 11.90% |
| 1996 | 10.00 | 6.38% |
| 1997 | 13.00 | 30.00% |
| 1998 | 14.00 | 7.69% |
| 1999 | 13.00 | -7.14% |
| 2000 | 15.00 | 15.38% |
| 2001 | 14.00 | -6.67% |
| 2002 | 12.00 | -14.29% |
| 2003 | 17.00 | 41.67% |
| 2004 | 17.00 | 0.00% |
| 2005 | 17.00 | 0.00% |
| 2006 | 15.00 | -11.76% |
| 2007 | 19.00 | 26.67% |
| 2008 | 17.00 | -10.53% |
| 2009 | 22.00 | 29.41% |
| 2010 | 23.00 | 4.55% |
| 2011 | 25.00 | 8.70% |
| 2012 | 30.00 | 20.00% |
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