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| year | consumption | change |
| 1980 | 6.70 | NA |
| 1981 | 7.00 | 4.48 % |
| 1982 | 7.10 | 1.43 % |
| 1983 | 7.50 | 5.63 % |
| 1984 | 7.20 | -4.00 % |
| 1985 | 8.00 | 11.11 % |
| 1986 | 8.40 | 5.00 % |
| 1987 | 8.00 | -4.76 % |
| 1988 | 7.20 | -10.00 % |
| 1989 | 7.90 | 9.72 % |
| 1990 | 8.20 | 3.80 % |
| 1991 | 8.30 | 1.22 % |
| 1992 | 8.40 | 1.20 % |
| 1993 | 8.40 | 0.00 % |
| 1994 | 8.10 | -3.57 % |
| 1995 | 8.20 | 1.23 % |
| 1996 | 7.90 | -3.66 % |
| 1997 | 9.20 | 16.46 % |
| 1998 | 9.50 | 3.26 % |
| 1999 | 9.70 | 2.11 % |
| 2000 | 11.00 | 13.40 % |
| 2001 | 10.00 | -9.09 % |
| 2002 | 10.00 | 0.00 % |
| 2003 | 11.00 | 10.00 % |
| 2004 | 7.10 | -35.45 % |
| 2005 | 9.80 | 38.03 % |
| 2006 | 9.30 | -5.10 % |
| 2007 | 8.30 | -10.75 % |
| 2008 | 7.70 | -7.23 % |
| 2009 | 9.30 | 20.78 % |
| 2010 | 8.80 | -5.38 % |
| 2011 | 9.30 | 5.68 % |
| 2012 | 9.30 | 0.00 % |
| 2013 | 9.00 | -3.23 % |
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