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| year | consumption | change |
| 1980 | 1.40 | NA |
| 1981 | 1.50 | 7.14 % |
| 1982 | 1.50 | 0.00 % |
| 1983 | 1.50 | 0.00 % |
| 1984 | 1.40 | -6.67 % |
| 1985 | 1.30 | -7.14 % |
| 1986 | 1.30 | 0.00 % |
| 1987 | 1.30 | 0.00 % |
| 1988 | 1.60 | 23.08 % |
| 1989 | 1.70 | 6.25 % |
| 1990 | 1.80 | 5.88 % |
| 1991 | 2.00 | 11.11 % |
| 1992 | 2.00 | 0.00 % |
| 1993 | 2.00 | 0.00 % |
| 1994 | 2.40 | 20.00 % |
| 1995 | 2.50 | 4.17 % |
| 1996 | 2.70 | 8.00 % |
| 1997 | 2.90 | 7.41 % |
| 1998 | 3.10 | 6.90 % |
| 1999 | 3.30 | 6.45 % |
| 2000 | 3.40 | 3.03 % |
| 2001 | 3.40 | 0.00 % |
| 2002 | 3.50 | 2.94 % |
| 2003 | 3.60 | 2.86 % |
| 2004 | 3.80 | 5.56 % |
| 2005 | 4.20 | 10.53 % |
| 2006 | 4.50 | 7.14 % |
| 2007 | 4.90 | 8.89 % |
| 2008 | 4.90 | 0.00 % |
| 2009 | 5.20 | 6.12 % |
| 2010 | 5.70 | 9.62 % |
| 2011 | 6.10 | 7.02 % |
| 2012 | 6.50 | 6.56 % |
| 2013 | 7.00 | 7.69 % |
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