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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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