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year | consumption | change |
1980 | 2.90 | NA |
1981 | 3.00 | 3.45% |
1982 | 3.20 | 6.67% |
1983 | 3.40 | 6.25% |
1984 | 3.50 | 2.94% |
1985 | 3.50 | 0.00% |
1986 | 3.30 | -5.71% |
1987 | 3.50 | 6.06% |
1988 | 3.70 | 5.71% |
1989 | 4.00 | 8.11% |
1990 | 4.30 | 7.50% |
1991 | 4.00 | -6.98% |
1992 | 4.00 | 0.00% |
1993 | 4.00 | 0.00% |
1994 | 4.00 | 0.00% |
1995 | 4.20 | 5.00% |
1996 | 4.30 | 2.38% |
1997 | 4.40 | 2.33% |
1998 | 4.40 | 0.00% |
1999 | 4.40 | 0.00% |
2000 | 4.50 | 2.27% |
2001 | 4.50 | 0.00% |
2002 | 4.50 | 0.00% |
2003 | 4.50 | 0.00% |
2004 | 4.60 | 2.22% |
2005 | 4.60 | 0.00% |
2006 | 4.90 | 6.52% |
2007 | 4.80 | -2.04% |
2008 | 4.90 | 2.08% |
2009 | 4.90 | 0.00% |
2010 | 4.70 | -4.08% |
2011 | 4.90 | 4.26% |
2012 | 4.90 | 0.00% |
2013 | 4.90 | 0.00% |
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