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| year | consumption | change |
| 1992 | .48 | NA |
| 1993 | .39 | -17.40% |
| 1994 | .36 | -9.90% |
| 1995 | .38 | 6.76% |
| 1996 | .36 | -4.75% |
| 1997 | .36 | -0.55% |
| 1998 | .39 | 8.91% |
| 1999 | .30 | -22.25% |
| 2000 | .30 | -2.30% |
| 2001 | .32 | 6.40% |
| 2002 | .34 | 7.59% |
| 2003 | .35 | 3.53% |
| 2004 | .35 | 0.28% |
| 2005 | .35 | -1.13% |
| 2006 | .35 | 0.00% |
| 2007 | .38 | 9.46% |
| 2008 | .38 | -1.57% |
| 2009 | .32 | -14.63% |
| 2010 | .26 | -19.94% |
| 2011 | .27 | 5.84% |
| 2012 | .27 | 0.00% |
| 2013 | .31 | 15.07% |
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