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year | consumption | change |
1986 | 2.40 | NA |
1987 | 2.50 | 4.17% |
1988 | 2.70 | 8.00% |
1989 | 2.90 | 7.41% |
1990 | 2.90 | 0.00% |
1991 | 3.00 | 3.45% |
1992 | 3.10 | 3.33% |
1993 | 3.10 | 0.00% |
1994 | 3.20 | 3.23% |
1995 | 3.10 | -3.13% |
1996 | 3.10 | 0.00% |
1997 | 3.10 | 0.00% |
1998 | 3.00 | -3.23% |
1999 | 3.00 | 0.00% |
2000 | 3.20 | 6.67% |
2001 | 3.10 | -3.13% |
2002 | 3.10 | 0.00% |
2003 | 3.20 | 3.23% |
2004 | 3.30 | 3.13% |
2005 | 3.40 | 3.03% |
2006 | 3.30 | -2.94% |
2007 | 3.30 | 0.00% |
2008 | 3.30 | 0.00% |
2009 | 1.60 | -51.52% |
2010 | 1.60 | 0.00% |
2011 | 1.60 | 0.00% |
2012 | 1.60 | 0.00% |
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