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| year | consumption | change |
| 1980 | 38.00 | NA |
| 1981 | 39.00 | 2.63% |
| 1982 | 39.00 | 0.00% |
| 1983 | 42.00 | 7.69% |
| 1984 | 46.00 | 9.52% |
| 1985 | 49.00 | 6.52% |
| 1986 | 50.00 | 2.04% |
| 1987 | 53.00 | 6.00% |
| 1988 | 48.00 | -9.43% |
| 1989 | 57.00 | 18.75% |
| 1990 | 65.00 | 14.04% |
| 1991 | 65.00 | 0.00% |
| 1992 | 61.00 | -6.15% |
| 1993 | 63.00 | 3.28% |
| 1994 | 66.00 | 4.76% |
| 1995 | 65.00 | -1.52% |
| 1996 | 67.00 | 3.08% |
| 1997 | 71.00 | 5.97% |
| 1998 | 74.00 | 4.23% |
| 1999 | 75.00 | 1.35% |
| 2000 | 76.00 | 1.33% |
| 2001 | 78.00 | 2.63% |
| 2002 | 81.00 | 3.85% |
| 2003 | 82.00 | 1.23% |
| 2004 | 84.00 | 2.44% |
| 2005 | 82.00 | -2.38% |
| 2006 | 87.00 | 6.10% |
| 2007 | 87.00 | 0.00% |
| 2008 | 84.00 | -3.45% |
| 2009 | 78.00 | -7.14% |
| 2010 | 85.00 | 8.97% |
| 2011 | 82.00 | -3.53% |
| 2012 | 82.00 | 0.00% |
| 2013 | 81.00 | -1.22% |
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