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| year | consumption | change |
| 1986 | 5.90 | NA |
| 1987 | 5.90 | 0.00 % |
| 1988 | 6.40 | 8.47 % |
| 1989 | 8.40 | 31.25 % |
| 1990 | 7.60 | -9.52 % |
| 1991 | 8.20 | 7.89 % |
| 1992 | 8.70 | 6.10 % |
| 1993 | 9.10 | 4.60 % |
| 1994 | 9.90 | 8.79 % |
| 1995 | 10.00 | 1.01 % |
| 1996 | 10.00 | 0.00 % |
| 1997 | 11.00 | 10.00 % |
| 1998 | 11.00 | 0.00 % |
| 1999 | 8.60 | -21.82 % |
| 2000 | 12.00 | 39.53 % |
| 2001 | 13.00 | 8.33 % |
| 2002 | 11.00 | -15.38 % |
| 2003 | 12.00 | 9.09 % |
| 2004 | 12.00 | 0.00 % |
| 2005 | 12.00 | 0.00 % |
| 2006 | 15.00 | 25.00 % |
| 2007 | 15.00 | 0.00 % |
| 2008 | 15.00 | 0.00 % |
| 2009 | 15.00 | 0.00 % |
| 2010 | 16.00 | 6.67 % |
| 2011 | 15.00 | -6.25 % |
| 2012 | 15.00 | 0.00 % |
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