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| year | consumption | change |
| 1992 | .20 | NA |
| 1993 | .15 | -26.00% |
| 1994 | .14 | -4.05% |
| 1995 | .13 | -7.75% |
| 1996 | .17 | 27.48% |
| 1997 | .14 | -13.77% |
| 1998 | .15 | 4.86% |
| 1999 | .15 | 1.32% |
| 2000 | .16 | 4.58% |
| 2001 | .16 | 1.25% |
| 2002 | .16 | 0.00% |
| 2003 | .17 | 7.41% |
| 2004 | .18 | 2.87% |
| 2005 | .20 | 11.73% |
| 2006 | .20 | 1.50% |
| 2007 | .22 | 7.88% |
| 2008 | .22 | -1.83% |
| 2009 | .20 | -7.44% |
| 2010 | .13 | -34.17% |
| 2011 | .14 | 8.40% |
| 2012 | .15 | 5.63% |
| 2013 | .23 | 55.33% |
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