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| year | consumption | change |
| 1986 | 9.80 | NA |
| 1987 | 10.00 | 2.04 % |
| 1988 | 9.80 | -2.00 % |
| 1989 | 9.90 | 1.02 % |
| 1990 | 11.00 | 11.11 % |
| 1991 | 9.60 | -12.73 % |
| 1992 | 9.00 | -6.25 % |
| 1993 | 9.00 | 0.00 % |
| 1994 | 8.50 | -5.56 % |
| 1995 | 9.50 | 11.76 % |
| 1996 | 11.00 | 15.79 % |
| 1997 | 10.00 | -9.09 % |
| 1998 | 11.00 | 10.00 % |
| 1999 | 11.00 | 0.00 % |
| 2000 | 11.00 | 0.00 % |
| 2001 | 9.40 | -14.55 % |
| 2002 | 9.80 | 4.26 % |
| 2003 | 9.70 | -1.02 % |
| 2004 | 9.90 | 2.06 % |
| 2005 | 11.00 | 11.11 % |
| 2006 | 11.00 | 0.00 % |
| 2007 | 9.80 | -10.91 % |
| 2008 | 9.50 | -3.06 % |
| 2009 | 9.20 | -3.16 % |
| 2010 | 11.00 | 19.57 % |
| 2011 | 11.00 | 0.00 % |
| 2012 | 10.00 | -9.09 % |
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