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year | consumption | change |
1986 | .70 | NA |
1987 | .70 | 0.00% |
1988 | 2.50 | 257.14% |
1989 | 3.40 | 36.00% |
1990 | 3.60 | 5.88% |
1991 | 4.00 | 11.11% |
1992 | 4.30 | 7.50% |
1993 | 4.50 | 4.65% |
1994 | 5.00 | 11.11% |
1995 | 5.70 | 14.00% |
1996 | 3.80 | -33.33% |
1997 | 6.00 | 57.89% |
1998 | 6.10 | 1.67% |
1999 | 6.10 | 0.00% |
2000 | 6.50 | 6.56% |
2001 | 6.50 | 0.00% |
2002 | 6.50 | 0.00% |
2003 | 7.00 | 7.69% |
2004 | 7.10 | 1.43% |
2005 | 7.20 | 1.41% |
2006 | 7.70 | 6.94% |
2007 | 6.60 | -14.29% |
2008 | 6.60 | 0.00% |
2009 | 6.70 | 1.52% |
2010 | 6.80 | 1.49% |
2011 | 6.40 | -5.88% |
2012 | 6.30 | -1.56% |
2013 | 6.40 | 1.59% |
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