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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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