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| year | consumption | change |
| 1986 | .40 | NA |
| 1988 | .50 | 25.00% |
| 1989 | .50 | 0.00% |
| 1990 | .20 | -60.00% |
| 1991 | .20 | 0.00% |
| 1992 | .30 | 50.00% |
| 1993 | .20 | -33.33% |
| 1994 | .20 | 0.00% |
| 1995 | 1.00 | 400.00% |
| 1996 | 1.00 | 0.00% |
| 1997 | .80 | -20.00% |
| 1998 | .70 | -12.50% |
| 1999 | 1.00 | 42.86% |
| 2000 | 1.40 | 40.00% |
| 2001 | 1.70 | 21.43% |
| 2002 | 1.60 | -5.88% |
| 2003 | 1.50 | -6.25% |
| 2004 | 1.60 | 6.67% |
| 2005 | 1.60 | 0.00% |
| 2006 | 1.60 | 0.00% |
| 2007 | 1.40 | -12.50% |
| 2008 | 1.40 | 0.00% |
| 2009 | 1.20 | -14.29% |
| 2010 | 1.40 | 16.67% |
| 2011 | 1.20 | -14.29% |
| 2012 | 1.20 | 0.00% |
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