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| year | consumption | change |
| 1980 | 8.47 | NA |
| 1981 | 7.85 | -7.27% |
| 1982 | 7.82 | -0.47% |
| 1983 | 7.99 | 2.26% |
| 1984 | 8.18 | 2.34% |
| 1985 | 8.37 | 2.30% |
| 1986 | 8.49 | 1.48% |
| 1987 | 8.65 | 1.91% |
| 1988 | 8.76 | 1.18% |
| 1989 | 8.91 | 1.77% |
| 1990 | 9.14 | 2.58% |
| 1991 | 9.76 | 6.83% |
| 1992 | 9.81 | 0.43% |
| 1993 | 9.81 | 0.08% |
| 1994 | 9.78 | -0.31% |
| 1995 | 10.06 | 2.85% |
| 1996 | 10.42 | 3.54% |
| 1997 | 10.32 | -0.93% |
| 1998 | 10.56 | 2.33% |
| 1999 | 10.70 | 1.33% |
| 2000 | 10.84 | 1.24% |
| 2001 | 11.05 | 2.01% |
| 2002 | 10.99 | -0.60% |
| 2003 | 11.12 | 1.19% |
| 2004 | 11.33 | 1.93% |
| 2005 | 11.37 | 0.28% |
| 2006 | 11.37 | 0.04% |
| 2007 | 11.21 | -1.38% |
| 2008 | 11.30 | 0.74% |
| 2009 | 10.73 | -4.98% |
| 2010 | 11.01 | 2.56% |
| 2011 | 10.77 | -2.14% |
| 2012 | 10.62 | -1.37% |
| 2013 | 10.81 | 1.75% |
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