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| year | consumption | change |
| 1980 | 2.76 | NA |
| 1981 | 2.75 | -0.29% |
| 1982 | 2.92 | 6.14% |
| 1983 | 2.88 | -1.40% |
| 1984 | 3.08 | 6.73% |
| 1985 | 3.19 | 3.58% |
| 1986 | 3.22 | 1.13% |
| 1987 | 3.36 | 4.16% |
| 1988 | 3.48 | 3.58% |
| 1989 | 3.65 | 4.92% |
| 1990 | 3.73 | 2.36% |
| 1991 | 3.72 | -0.27% |
| 1992 | 3.82 | 2.71% |
| 1993 | 3.93 | 2.69% |
| 1994 | 3.93 | 0.15% |
| 1995 | 4.05 | 2.90% |
| 1996 | 4.22 | 4.40% |
| 1997 | 4.56 | 7.86% |
| 1998 | 4.59 | 0.72% |
| 1999 | 4.81 | 4.79% |
| 2000 | 4.84 | 0.60% |
| 2001 | 5.01 | 3.53% |
| 2002 | 5.10 | 1.90% |
| 2003 | 5.29 | 3.66% |
| 2004 | 5.47 | 3.31% |
| 2005 | 5.73 | 4.76% |
| 2006 | 5.79 | 1.12% |
| 2007 | 5.93 | 2.45% |
| 2008 | 5.99 | 0.98% |
| 2009 | 6.00 | 0.23% |
| 2010 | 5.89 | -1.90% |
| 2011 | 5.91 | 0.27% |
| 2012 | 5.80 | -1.76% |
| 2013 | 5.74 | -1.10% |
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