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| year | consumption | change |
| 1980 | 3.70 | NA |
| 1981 | 3.50 | -5.41% |
| 1982 | 3.40 | -2.86% |
| 1983 | 2.40 | -29.41% |
| 1984 | 3.80 | 58.33% |
| 1985 | 3.40 | -10.53% |
| 1986 | 2.20 | -35.29% |
| 1987 | 1.60 | -27.27% |
| 1988 | 3.70 | 131.25% |
| 1989 | 3.20 | -13.51% |
| 1990 | 3.30 | 3.13% |
| 1991 | 3.30 | 0.00% |
| 1992 | 3.30 | 0.00% |
| 1993 | 3.40 | 3.03% |
| 1994 | 3.40 | 0.00% |
| 1995 | 3.40 | 0.00% |
| 1996 | 3.40 | 0.00% |
| 1997 | 3.50 | 2.94% |
| 1998 | 3.60 | 2.86% |
| 1999 | 3.60 | 0.00% |
| 2000 | 3.70 | 2.78% |
| 2001 | 3.80 | 2.70% |
| 2002 | 3.80 | 0.00% |
| 2003 | 3.80 | 0.00% |
| 2004 | 3.90 | 2.63% |
| 2005 | 3.90 | 0.00% |
| 2006 | 4.00 | 2.56% |
| 2007 | 5.60 | 40.00% |
| 2008 | 5.70 | 1.79% |
| 2009 | 5.00 | -12.28% |
| 2010 | 6.50 | 30.00% |
| 2011 | 7.00 | 7.69% |
| 2012 | 7.00 | 0.00% |
| 2013 | 7.00 | 0.00% |
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