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| year | consumption | change |
| 1986 | .80 | NA |
| 1987 | .90 | 12.50% |
| 1988 | .80 | -11.11% |
| 1989 | .90 | 12.50% |
| 1990 | .90 | 0.00% |
| 1991 | .90 | 0.00% |
| 1992 | 1.00 | 11.11% |
| 1993 | .90 | -10.00% |
| 1994 | 1.00 | 11.11% |
| 1995 | 1.00 | 0.00% |
| 1996 | 1.00 | 0.00% |
| 1997 | 1.20 | 20.00% |
| 1998 | 1.00 | -16.67% |
| 1999 | .80 | -20.00% |
| 2000 | 1.00 | 25.00% |
| 2001 | .80 | -20.00% |
| 2002 | .70 | -12.50% |
| 2003 | 1.30 | 85.71% |
| 2004 | 1.40 | 7.69% |
| 2005 | 1.60 | 14.29% |
| 2006 | 1.80 | 12.50% |
| 2007 | 2.40 | 33.33% |
| 2008 | 1.90 | -20.83% |
| 2009 | 1.80 | -5.26% |
| 2010 | 2.00 | 11.11% |
| 2011 | 2.90 | 45.00% |
| 2012 | 3.00 | 3.45% |
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