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| year | consumption | change |
| 1980 | 60.00 | NA |
| 1981 | 59.00 | -1.67% |
| 1982 | 58.00 | -1.69% |
| 1983 | 59.00 | 1.72% |
| 1984 | 61.00 | 3.39% |
| 1985 | 62.00 | 1.64% |
| 1986 | 63.00 | 1.61% |
| 1987 | 66.00 | 4.76% |
| 1988 | 69.00 | 4.55% |
| 1989 | 72.00 | 4.35% |
| 1990 | 73.00 | 1.39% |
| 1991 | 76.00 | 4.11% |
| 1992 | 78.00 | 2.63% |
| 1993 | 80.00 | 2.56% |
| 1994 | 82.00 | 2.50% |
| 1995 | 84.00 | 2.44% |
| 1996 | 87.00 | 3.57% |
| 1997 | 89.00 | 2.30% |
| 1998 | 93.00 | 4.49% |
| 1999 | 95.00 | 2.15% |
| 2000 | 99.00 | 4.21% |
| 2001 | 101.00 | 2.02% |
| 2002 | 102.00 | 0.99% |
| 2003 | 104.00 | 1.96% |
| 2004 | 108.00 | 3.85% |
| 2005 | 108.00 | 0.00% |
| 2006 | 110.00 | 1.85% |
| 2007 | 112.00 | 1.82% |
| 2008 | 111.00 | -0.89% |
| 2009 | 106.00 | -4.50% |
| 2010 | 108.00 | 1.89% |
| 2011 | 110.00 | 1.85% |
| 2012 | 108.00 | -1.82% |
| 2013 | 107.00 | -0.93% |
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