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| year | consumption | change |
| 1980 | 45.00 | NA |
| 1981 | 45.00 | 0.00% |
| 1982 | 45.00 | 0.00% |
| 1983 | 46.00 | 2.22% |
| 1984 | 48.00 | 4.35% |
| 1985 | 50.00 | 4.17% |
| 1986 | 51.00 | 2.00% |
| 1987 | 54.00 | 5.88% |
| 1988 | 56.00 | 3.70% |
| 1989 | 58.00 | 3.57% |
| 1990 | 59.00 | 1.72% |
| 1991 | 62.00 | 5.08% |
| 1992 | 64.00 | 3.23% |
| 1993 | 65.00 | 1.56% |
| 1994 | 68.00 | 4.62% |
| 1995 | 70.00 | 2.94% |
| 1996 | 71.00 | 1.43% |
| 1997 | 73.00 | 2.82% |
| 1998 | 75.00 | 2.74% |
| 1999 | 75.00 | 0.00% |
| 2000 | 79.00 | 5.33% |
| 2001 | 79.00 | 0.00% |
| 2002 | 80.00 | 1.27% |
| 2003 | 81.00 | 1.25% |
| 2004 | 83.00 | 2.47% |
| 2005 | 83.00 | 0.00% |
| 2006 | 85.00 | 2.41% |
| 2007 | 85.00 | 0.00% |
| 2008 | 84.00 | -1.18% |
| 2009 | 78.00 | -7.14% |
| 2010 | 84.00 | 7.69% |
| 2011 | 82.00 | -2.38% |
| 2012 | 82.00 | 0.00% |
| 2013 | 82.00 | 0.00% |
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