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| year | consumption | change |
| 1980 | 2.49 | NA |
| 1981 | 2.81 | 12.51% |
| 1982 | 3.23 | 15.25% |
| 1983 | 3.25 | 0.46% |
| 1984 | 3.57 | 9.97% |
| 1985 | 3.56 | -0.28% |
| 1986 | 3.80 | 6.76% |
| 1987 | 3.82 | 0.42% |
| 1988 | 3.95 | 3.27% |
| 1989 | 3.59 | -9.05% |
| 1990 | 3.30 | -7.97% |
| 1991 | 3.68 | 11.36% |
| 1992 | 3.37 | -8.40% |
| 1993 | 3.87 | 15.02% |
| 1994 | 4.10 | 5.73% |
| 1995 | 4.17 | 1.78% |
| 1996 | 4.16 | -0.14% |
| 1997 | 4.46 | 7.21% |
| 1998 | 4.27 | -4.44% |
| 1999 | 4.63 | 8.49% |
| 2000 | 4.55 | -1.77% |
| 2001 | 4.60 | 1.19% |
| 2002 | 4.28 | -6.91% |
| 2003 | 4.74 | 10.82% |
| 2004 | 5.18 | 9.15% |
| 2005 | 5.08 | -1.93% |
| 2006 | 5.27 | 3.76% |
| 2007 | 5.45 | 3.34% |
| 2008 | 5.88 | 7.97% |
| 2009 | 5.48 | -6.79% |
| 2010 | 5.59 | 1.93% |
| 2011 | 5.83 | 4.42% |
| 2012 | 6.08 | 4.15% |
| 2013 | 5.77 | -5.07% |
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