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| year | consumption | change |
| 1980 | 6.07 | NA |
| 1981 | 5.87 | -3.21% |
| 1982 | 5.76 | -1.91% |
| 1983 | 5.60 | -2.74% |
| 1984 | 6.00 | 7.05% |
| 1985 | 6.02 | 0.30% |
| 1986 | 6.11 | 1.61% |
| 1987 | 6.33 | 3.48% |
| 1988 | 6.49 | 2.64% |
| 1989 | 6.68 | 2.83% |
| 1990 | 6.72 | 0.67% |
| 1991 | 6.87 | 2.14% |
| 1992 | 6.84 | -0.45% |
| 1993 | 6.82 | -0.18% |
| 1994 | 6.72 | -1.45% |
| 1995 | 7.03 | 4.58% |
| 1996 | 7.07 | 0.50% |
| 1997 | 7.16 | 1.30% |
| 1998 | 7.38 | 3.03% |
| 1999 | 7.50 | 1.68% |
| 2000 | 7.57 | 0.91% |
| 2001 | 7.62 | 0.62% |
| 2002 | 7.64 | 0.29% |
| 2003 | 7.87 | 3.00% |
| 2004 | 8.07 | 2.53% |
| 2005 | 8.11 | 0.57% |
| 2006 | 8.06 | -0.58% |
| 2007 | 7.96 | -1.30% |
| 2008 | 7.89 | -0.82% |
| 2009 | 7.36 | -6.79% |
| 2010 | 7.66 | 4.04% |
| 2011 | 7.48 | -2.29% |
| 2012 | 7.20 | -3.73% |
| 2013 | 6.98 | -3.12% |
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