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| year | consumption | change |
| 1980 | 7.10 | NA |
| 1981 | 7.30 | 2.82% |
| 1982 | 7.20 | -1.37% |
| 1983 | 5.90 | -18.06% |
| 1984 | 5.40 | -8.47% |
| 1985 | 5.50 | 1.85% |
| 1986 | 6.60 | 20.00% |
| 1987 | 5.30 | -19.70% |
| 1988 | 5.40 | 1.89% |
| 1989 | 6.40 | 18.52% |
| 1990 | 6.90 | 7.81% |
| 1991 | 5.60 | -18.84% |
| 1992 | 5.80 | 3.57% |
| 1993 | 6.10 | 5.17% |
| 1994 | 6.40 | 4.92% |
| 1995 | 6.90 | 7.81% |
| 1996 | 7.10 | 2.90% |
| 1997 | 7.10 | 0.00% |
| 1998 | 6.90 | -2.82% |
| 1999 | 7.70 | 11.59% |
| 2000 | 9.30 | 20.78% |
| 2001 | 10.00 | 7.53% |
| 2002 | 12.00 | 20.00% |
| 2003 | 16.00 | 33.33% |
| 2004 | 17.00 | 6.25% |
| 2005 | 17.00 | 0.00% |
| 2006 | 18.00 | 5.88% |
| 2007 | 17.00 | -5.56% |
| 2008 | 14.00 | -17.65% |
| 2009 | 9.40 | -32.86% |
| 2010 | 9.20 | -2.13% |
| 2011 | 9.40 | 2.17% |
| 2012 | 9.40 | 0.00% |
| 2013 | 9.40 | 0.00% |
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