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| year | consumption | change |
| 1980 | 3.00 | NA |
| 1981 | 3.00 | 0.00% |
| 1982 | 3.00 | 0.00% |
| 1983 | 3.00 | 0.00% |
| 1984 | 3.00 | 0.00% |
| 1985 | 2.90 | -3.33% |
| 1986 | 3.40 | 17.24% |
| 1987 | 3.50 | 2.94% |
| 1988 | 3.70 | 5.71% |
| 1989 | 3.20 | -13.51% |
| 1990 | 3.40 | 6.25% |
| 1991 | 3.80 | 11.76% |
| 1992 | 3.90 | 2.63% |
| 1993 | 4.20 | 7.69% |
| 1994 | 4.60 | 9.52% |
| 1995 | 4.60 | 0.00% |
| 1996 | 4.70 | 2.17% |
| 1997 | 7.60 | 61.70% |
| 1998 | 7.20 | -5.26% |
| 1999 | 7.20 | 0.00% |
| 2000 | 7.50 | 4.17% |
| 2001 | 7.60 | 1.33% |
| 2002 | 7.80 | 2.63% |
| 2003 | 8.10 | 3.85% |
| 2004 | 8.20 | 1.23% |
| 2005 | 8.30 | 1.22% |
| 2006 | 8.40 | 1.20% |
| 2007 | 9.50 | 13.10% |
| 2008 | 13.00 | 36.84% |
| 2009 | 12.00 | -7.69% |
| 2010 | 12.00 | 0.00% |
| 2011 | 12.00 | 0.00% |
| 2012 | 12.00 | 0.00% |
| 2013 | 12.00 | 0.00% |
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