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| year | consumption | change |
| 1986 | 8.00 | NA |
| 1987 | 6.40 | -20.00% |
| 1988 | 8.80 | 37.50% |
| 1989 | 9.60 | 9.09% |
| 1990 | 9.10 | -5.21% |
| 1991 | 8.70 | -4.40% |
| 1992 | 8.70 | 0.00% |
| 1993 | 8.40 | -3.45% |
| 1994 | 8.80 | 4.76% |
| 1995 | 8.50 | -3.41% |
| 1996 | 10.00 | 17.65% |
| 1997 | 11.00 | 10.00% |
| 1998 | 11.00 | 0.00% |
| 1999 | 10.00 | -9.09% |
| 2000 | 10.00 | 0.00% |
| 2001 | 9.50 | -5.00% |
| 2002 | 9.30 | -2.11% |
| 2003 | 12.00 | 29.03% |
| 2004 | 13.00 | 8.33% |
| 2005 | 9.90 | -23.85% |
| 2006 | 10.00 | 1.01% |
| 2007 | 13.00 | 30.00% |
| 2008 | 12.00 | -7.69% |
| 2009 | 15.00 | 25.00% |
| 2010 | 17.00 | 13.33% |
| 2011 | 18.00 | 5.88% |
| 2012 | 20.00 | 11.11% |
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