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| year | consumption | change |
| 1986 | 7.10 | NA |
| 1987 | 8.80 | 23.94% |
| 1988 | 8.90 | 1.14% |
| 1989 | 8.60 | -3.37% |
| 1990 | 8.10 | -5.81% |
| 1991 | 9.50 | 17.28% |
| 1992 | 9.50 | 0.00% |
| 1993 | 10.00 | 5.26% |
| 1994 | 10.00 | 0.00% |
| 1995 | 10.00 | 0.00% |
| 1996 | 11.00 | 10.00% |
| 1997 | 11.00 | 0.00% |
| 1998 | 12.00 | 9.09% |
| 1999 | 12.00 | 0.00% |
| 2000 | 12.00 | 0.00% |
| 2001 | 7.30 | -39.17% |
| 2002 | 7.00 | -4.11% |
| 2003 | 9.20 | 31.43% |
| 2004 | 10.00 | 8.70% |
| 2005 | 12.00 | 20.00% |
| 2006 | 11.00 | -8.33% |
| 2007 | 11.00 | 0.00% |
| 2008 | 12.00 | 9.09% |
| 2009 | 11.00 | -8.33% |
| 2010 | 12.00 | 9.09% |
| 2011 | 15.00 | 25.00% |
| 2012 | 10.00 | -33.33% |
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