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| year | consumption | change |
| 1992 | .31 | NA |
| 1993 | .28 | -9.87% |
| 1994 | .27 | -3.18% |
| 1995 | .30 | 8.76% |
| 1996 | .30 | 0.00% |
| 1997 | .31 | 2.35% |
| 1998 | .29 | -5.57% |
| 1999 | .32 | 10.42% |
| 2000 | .40 | 26.10% |
| 2001 | .50 | 25.19% |
| 2002 | .59 | 16.53% |
| 2003 | .76 | 29.74% |
| 2004 | .81 | 6.32% |
| 2005 | .83 | 3.10% |
| 2006 | .84 | 1.08% |
| 2007 | .90 | 7.02% |
| 2008 | .97 | 7.67% |
| 2009 | .89 | -8.15% |
| 2010 | .99 | 11.46% |
| 2011 | .98 | -0.81% |
| 2012 | 1.13 | 15.14% |
| 2013 | 1.15 | 1.41% |
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