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| year | consumption | change |
| 1980 | 10.00 | NA |
| 1981 | 10.00 | 0.00% |
| 1982 | 7.00 | -30.00% |
| 1983 | 6.00 | -14.29% |
| 1984 | 7.00 | 16.67% |
| 1985 | 6.30 | -10.00% |
| 1986 | 6.80 | 7.94% |
| 1987 | 7.20 | 5.88% |
| 1988 | 6.70 | -6.94% |
| 1989 | 7.40 | 10.45% |
| 1990 | 7.60 | 2.70% |
| 1991 | 8.20 | 7.89% |
| 1992 | 8.60 | 4.88% |
| 1993 | 8.70 | 1.16% |
| 1994 | 8.40 | -3.45% |
| 1995 | 8.40 | 0.00% |
| 1996 | 8.60 | 2.38% |
| 1997 | 8.60 | 0.00% |
| 1998 | 8.70 | 1.16% |
| 1999 | 8.70 | 0.00% |
| 2000 | 8.60 | -1.15% |
| 2001 | 8.60 | 0.00% |
| 2002 | 10.00 | 16.28% |
| 2003 | 10.00 | 0.00% |
| 2004 | 11.00 | 10.00% |
| 2005 | 11.00 | 0.00% |
| 2006 | 14.00 | 27.27% |
| 2007 | 14.00 | 0.00% |
| 2008 | 14.00 | 0.00% |
| 2009 | 15.00 | 7.14% |
| 2010 | 15.00 | 0.00% |
| 2011 | 15.00 | 0.00% |
| 2012 | 15.00 | 0.00% |
| 2013 | 15.00 | 0.00% |
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