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| year | consumption | change |
| 1980 | 60.00 | NA |
| 1981 | 62.00 | 3.33% |
| 1982 | 62.00 | 0.00% |
| 1983 | 63.00 | 1.61% |
| 1984 | 66.00 | 4.76% |
| 1985 | 68.00 | 3.03% |
| 1986 | 72.00 | 5.88% |
| 1987 | 71.00 | -1.39% |
| 1988 | 74.00 | 4.23% |
| 1989 | 75.00 | 1.35% |
| 1990 | 65.00 | -13.33% |
| 1991 | 53.00 | -18.46% |
| 1992 | 50.00 | -5.66% |
| 1993 | 49.00 | -2.00% |
| 1994 | 48.00 | -2.04% |
| 1995 | 50.00 | 4.17% |
| 1996 | 52.00 | 4.00% |
| 1997 | 48.00 | -7.69% |
| 1998 | 45.00 | -6.25% |
| 1999 | 41.00 | -8.89% |
| 2000 | 42.00 | 2.44% |
| 2001 | 43.00 | 2.38% |
| 2002 | 43.00 | 0.00% |
| 2003 | 46.00 | 6.98% |
| 2004 | 47.00 | 2.17% |
| 2005 | 48.00 | 2.13% |
| 2006 | 49.00 | 2.08% |
| 2007 | 50.00 | 2.04% |
| 2008 | 50.00 | 0.00% |
| 2009 | 46.00 | -8.00% |
| 2010 | 48.00 | 4.35% |
| 2011 | 50.00 | 4.17% |
| 2012 | 49.00 | -2.00% |
| 2013 | 43.00 | -12.24% |
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