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| year | consumption | change |
| 1980 | 1.60 | NA |
| 1981 | 1.50 | -6.25 % |
| 1982 | 1.40 | -6.67 % |
| 1983 | 1.40 | 0.00 % |
| 1984 | 1.50 | 7.14 % |
| 1985 | 1.50 | 0.00 % |
| 1986 | 1.90 | 26.67 % |
| 1987 | 1.60 | -15.79 % |
| 1988 | 1.10 | -31.25 % |
| 1989 | 1.60 | 45.45 % |
| 1990 | 2.20 | 37.50 % |
| 1991 | 2.50 | 13.64 % |
| 1992 | 2.10 | -16.00 % |
| 1993 | 2.10 | 0.00 % |
| 1994 | 2.00 | -4.76 % |
| 1995 | 2.30 | 15.00 % |
| 1996 | 1.90 | -17.39 % |
| 1997 | 3.20 | 68.42 % |
| 1998 | 3.20 | 0.00 % |
| 1999 | 3.30 | 3.12 % |
| 2000 | 4.70 | 42.42 % |
| 2001 | 6.30 | 34.04 % |
| 2002 | 6.00 | -4.76 % |
| 2003 | 6.30 | 5.00 % |
| 2004 | 6.80 | 7.94 % |
| 2005 | 7.10 | 4.41 % |
| 2006 | 7.20 | 1.41 % |
| 2007 | 7.30 | 1.39 % |
| 2008 | 3.60 | -50.68 % |
| 2009 | 3.50 | -2.78 % |
| 2010 | 3.50 | 0.00 % |
| 2011 | 3.50 | 0.00 % |
| 2012 | 3.50 | 0.00 % |
| 2013 | 3.50 | 0.00 % |
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