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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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