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| year | consumption | change |
| 1980 | 7.90 | NA |
| 1981 | 9.20 | 16.46% |
| 1982 | 9.10 | -1.09% |
| 1983 | 8.90 | -2.20% |
| 1984 | 9.20 | 3.37% |
| 1985 | 9.10 | -1.09% |
| 1986 | 9.60 | 5.49% |
| 1987 | 7.20 | -25.00% |
| 1988 | 7.30 | 1.39% |
| 1989 | 7.40 | 1.37% |
| 1990 | 6.80 | -8.11% |
| 1991 | 4.00 | -41.18% |
| 1992 | 3.70 | -7.50% |
| 1993 | 3.90 | 5.41% |
| 1994 | 3.90 | 0.00% |
| 1995 | 3.90 | 0.00% |
| 1996 | 3.90 | 0.00% |
| 1997 | 3.90 | 0.00% |
| 1998 | 3.90 | 0.00% |
| 1999 | 3.90 | 0.00% |
| 2000 | 4.90 | 25.64% |
| 2001 | 5.10 | 4.08% |
| 2002 | 6.50 | 27.45% |
| 2003 | 6.50 | 0.00% |
| 2004 | 6.40 | -1.54% |
| 2005 | 6.50 | 1.56% |
| 2006 | 6.50 | 0.00% |
| 2007 | 5.60 | -13.85% |
| 2008 | 5.60 | 0.00% |
| 2009 | 5.40 | -3.57% |
| 2010 | 5.60 | 3.70% |
| 2011 | 5.60 | 0.00% |
| 2012 | 5.60 | 0.00% |
| 2013 | 5.60 | 0.00% |
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