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| year | consumption | change |
| 1980 | 1.50 | NA |
| 1981 | 1.50 | 0.00% |
| 1982 | 1.60 | 6.67% |
| 1983 | 1.70 | 6.25% |
| 1984 | 1.70 | 0.00% |
| 1985 | 1.40 | -17.65% |
| 1986 | 1.40 | 0.00% |
| 1987 | 1.60 | 14.29% |
| 1988 | 1.50 | -6.25% |
| 1989 | 1.70 | 13.33% |
| 1990 | 2.10 | 23.53% |
| 1991 | 1.70 | -19.05% |
| 1992 | 1.70 | 0.00% |
| 1993 | 3.60 | 111.76% |
| 1994 | 4.00 | 11.11% |
| 1995 | 4.90 | 22.50% |
| 1996 | 5.00 | 2.04% |
| 1997 | 5.20 | 4.00% |
| 1998 | 5.50 | 5.77% |
| 1999 | 5.60 | 1.82% |
| 2000 | 5.60 | 0.00% |
| 2001 | 5.70 | 1.79% |
| 2002 | 5.90 | 3.51% |
| 2003 | 6.10 | 3.39% |
| 2004 | 6.10 | 0.00% |
| 2005 | 6.10 | 0.00% |
| 2006 | 6.10 | 0.00% |
| 2007 | 4.90 | -19.67% |
| 2008 | 3.00 | -38.78% |
| 2009 | 3.20 | 6.67% |
| 2010 | 3.20 | 0.00% |
| 2011 | 3.20 | 0.00% |
| 2012 | 2.90 | -9.38% |
| 2013 | 2.80 | -3.45% |
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