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| year | consumption | change |
| 1991 | .02 | NA |
| 1992 | .02 | -5.56% |
| 1993 | .02 | 41.18% |
| 1994 | .02 | -4.17% |
| 1995 | .03 | 39.13% |
| 1996 | .03 | -3.13% |
| 1997 | .03 | -3.23% |
| 1998 | .03 | 10.00% |
| 1999 | .04 | 18.18% |
| 2000 | .04 | 7.69% |
| 2001 | .05 | 11.90% |
| 2002 | .05 | 6.38% |
| 2003 | .05 | 8.00% |
| 2004 | .06 | 5.56% |
| 2005 | .06 | 3.51% |
| 2006 | .06 | 6.78% |
| 2007 | .07 | 3.17% |
| 2008 | .07 | 3.08% |
| 2009 | .07 | -1.49% |
| 2010 | .06 | -4.55% |
| 2011 | .07 | 6.35% |
| 2012 | .07 | 1.49% |
| 2013 | .08 | 13.24% |
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