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| year | consumption | change |
| 1980 | 6.90 | NA |
| 1981 | 7.00 | 1.45% |
| 1982 | 7.20 | 2.86% |
| 1983 | 7.00 | -2.78% |
| 1984 | 7.10 | 1.43% |
| 1985 | 7.10 | 0.00% |
| 1986 | 7.90 | 11.27% |
| 1987 | 8.10 | 2.53% |
| 1988 | 8.30 | 2.47% |
| 1989 | 9.20 | 10.84% |
| 1990 | 9.90 | 7.61% |
| 1991 | 9.40 | -5.05% |
| 1992 | 8.30 | -11.70% |
| 1993 | 8.80 | 6.02% |
| 1994 | 8.20 | -6.82% |
| 1995 | 8.50 | 3.66% |
| 1996 | 8.80 | 3.53% |
| 1997 | 9.60 | 9.09% |
| 1998 | 9.00 | -6.25% |
| 1999 | 9.70 | 7.78% |
| 2000 | 10.00 | 3.09% |
| 2001 | 10.00 | 0.00% |
| 2002 | 10.00 | 0.00% |
| 2003 | 10.00 | 0.00% |
| 2004 | 10.00 | 0.00% |
| 2005 | 10.00 | 0.00% |
| 2006 | 10.00 | 0.00% |
| 2007 | 9.00 | -10.00% |
| 2008 | 7.60 | -15.56% |
| 2009 | 7.20 | -5.26% |
| 2010 | 7.50 | 4.17% |
| 2011 | 8.10 | 8.00% |
| 2012 | 7.90 | -2.47% |
| 2013 | 7.60 | -3.80% |
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