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| year | consumption | change |
| 1992 | .12 | NA |
| 1993 | .13 | 5.00% |
| 1994 | .11 | -11.11% |
| 1995 | .12 | 2.68% |
| 1996 | .13 | 8.70% |
| 1997 | .12 | -2.40% |
| 1998 | .14 | 14.75% |
| 1999 | .13 | -7.86% |
| 2000 | .12 | -10.85% |
| 2001 | .11 | -7.83% |
| 2002 | .11 | 0.94% |
| 2003 | .12 | 9.35% |
| 2004 | .12 | 1.71% |
| 2005 | .12 | 2.52% |
| 2006 | .12 | -0.82% |
| 2007 | .12 | -0.83% |
| 2008 | .12 | 0.00% |
| 2009 | .12 | -4.17% |
| 2010 | .13 | 8.70% |
| 2011 | .13 | 7.20% |
| 2012 | .13 | -6.72% |
| 2013 | .12 | -6.40% |
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