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| year | consumption | change |
| 1986 | 4.20 | NA |
| 1987 | 4.30 | 2.38 % |
| 1988 | 4.40 | 2.33 % |
| 1989 | 4.30 | -2.27 % |
| 1990 | 4.20 | -2.33 % |
| 1991 | 4.20 | 0.00 % |
| 1992 | 5.80 | 38.10 % |
| 1993 | 5.30 | -8.62 % |
| 1994 | 6.20 | 16.98 % |
| 1995 | 6.90 | 11.29 % |
| 1996 | 7.80 | 13.04 % |
| 1997 | 6.80 | -12.82 % |
| 1998 | 8.00 | 17.65 % |
| 1999 | 9.00 | 12.50 % |
| 2000 | 9.50 | 5.56 % |
| 2001 | 10.00 | 5.26 % |
| 2002 | 9.90 | -1.00 % |
| 2003 | 9.50 | -4.04 % |
| 2004 | 9.40 | -1.05 % |
| 2005 | 9.60 | 2.13 % |
| 2006 | 11.00 | 14.58 % |
| 2007 | 9.60 | -12.73 % |
| 2008 | 9.50 | -1.04 % |
| 2009 | 11.00 | 15.79 % |
| 2010 | 10.00 | -9.09 % |
| 2011 | 11.00 | 10.00 % |
| 2012 | 9.90 | -10.00 % |
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