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year | consumption | change |
1986 | 3.50 | NA |
1987 | 2.50 | -28.57% |
1988 | 2.40 | -4.00% |
1989 | 2.30 | -4.17% |
1990 | 2.30 | 0.00% |
1991 | 2.20 | -4.35% |
1992 | 2.00 | -9.09% |
1993 | 2.00 | 0.00% |
1994 | 2.00 | 0.00% |
1995 | 2.00 | 0.00% |
1996 | 2.00 | 0.00% |
1997 | 2.00 | 0.00% |
1998 | 2.00 | 0.00% |
1999 | 2.00 | 0.00% |
2000 | 1.90 | -5.00% |
2001 | 1.90 | 0.00% |
2002 | 2.40 | 26.32% |
2003 | 2.50 | 4.17% |
2004 | 2.60 | 4.00% |
2005 | 2.70 | 3.85% |
2006 | 3.10 | 14.81% |
2007 | 3.10 | 0.00% |
2008 | 3.40 | 9.68% |
2009 | 3.00 | -11.76% |
2010 | 3.10 | 3.33% |
2011 | 3.00 | -3.23% |
2012 | 3.00 | 0.00% |
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