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| year | consumption | change |
| 1992 | .23 | NA |
| 1993 | .17 | -25.88% |
| 1994 | .16 | -4.14% |
| 1995 | .17 | 6.17% |
| 1996 | .17 | 0.00% |
| 1997 | .16 | -6.40% |
| 1998 | .16 | -0.62% |
| 1999 | .15 | -7.50% |
| 2000 | .15 | 4.05% |
| 2001 | .16 | 4.55% |
| 2002 | .15 | -4.35% |
| 2003 | .16 | 3.90% |
| 2004 | .18 | 10.00% |
| 2005 | .19 | 5.11% |
| 2006 | .18 | -0.54% |
| 2007 | .17 | -5.98% |
| 2008 | .17 | -4.62% |
| 2009 | .17 | 0.00% |
| 2010 | .17 | 3.64% |
| 2011 | .16 | -5.26% |
| 2012 | .17 | 4.94% |
| 2013 | .16 | -5.88% |
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