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| year | consumption | change |
| 1986 | .30 | NA |
| 1988 | .20 | -33.33% |
| 1989 | .20 | 0.00% |
| 1990 | .20 | 0.00% |
| 1991 | .20 | 0.00% |
| 1992 | .20 | 0.00% |
| 1993 | .20 | 0.00% |
| 1994 | .20 | 0.00% |
| 1995 | .20 | 0.00% |
| 1996 | .20 | 0.00% |
| 1997 | .20 | 0.00% |
| 1998 | .30 | 50.00% |
| 1999 | .30 | 0.00% |
| 2000 | .20 | -33.33% |
| 2001 | .20 | 0.00% |
| 2003 | .50 | 150.00% |
| 2004 | .20 | -60.00% |
| 2005 | 1.00 | 400.00% |
| 2006 | 1.00 | 0.00% |
| 2007 | 1.00 | 0.00% |
| 2008 | 1.10 | 10.00% |
| 2009 | .90 | -18.18% |
| 2010 | .80 | -11.11% |
| 2011 | .90 | 12.50% |
| 2012 | .90 | 0.00% |
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