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| year | consumption | change |
| 1980 | 5.04 | NA |
| 1981 | 4.62 | -8.36% |
| 1982 | 4.94 | 6.97% |
| 1983 | 4.83 | -2.27% |
| 1984 | 4.53 | -6.26% |
| 1985 | 4.82 | 6.43% |
| 1986 | 5.01 | 4.05% |
| 1987 | 5.20 | 3.79% |
| 1988 | 5.19 | -0.15% |
| 1989 | 4.87 | -6.32% |
| 1990 | 4.02 | -17.43% |
| 1991 | 3.90 | -2.81% |
| 1992 | 3.81 | -2.41% |
| 1993 | 4.01 | 5.20% |
| 1994 | 3.85 | -4.04% |
| 1995 | 3.75 | -2.57% |
| 1996 | 4.19 | 11.85% |
| 1997 | 4.16 | -0.81% |
| 1998 | 3.92 | -5.61% |
| 1999 | 4.04 | 2.88% |
| 2000 | 3.59 | -11.20% |
| 2001 | 3.54 | -1.37% |
| 2002 | 3.55 | 0.37% |
| 2003 | 3.71 | 4.51% |
| 2004 | 3.82 | 2.97% |
| 2005 | 3.79 | -0.79% |
| 2006 | 4.00 | 5.49% |
| 2007 | 3.99 | -0.08% |
| 2008 | 4.05 | 1.40% |
| 2009 | 3.90 | -3.68% |
| 2010 | 4.21 | 7.87% |
| 2011 | 4.32 | 2.69% |
| 2012 | 4.19 | -3.10% |
| 2013 | 4.28 | 2.32% |
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