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year | consumption | change |
1992 | .30 | NA |
1993 | .26 | -11.86% |
1994 | .25 | -2.31% |
1995 | .21 | -17.72% |
1996 | .23 | 10.05% |
1997 | .22 | -4.78% |
1998 | .23 | 3.20% |
1999 | .24 | 7.08% |
2000 | .24 | -1.24% |
2001 | .25 | 3.35% |
2002 | .25 | 2.02% |
2003 | .27 | 6.75% |
2004 | .27 | 1.86% |
2005 | .28 | 3.65% |
2006 | .28 | -1.41% |
2007 | .27 | -2.86% |
2008 | .21 | -23.16% |
2009 | .19 | -10.05% |
2010 | .19 | 3.19% |
2011 | .19 | -1.55% |
2012 | .20 | 3.66% |
2013 | .21 | 4.55% |
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