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| year | consumption | change |
| 1986 | .60 | NA |
| 1987 | .70 | 16.67% |
| 1988 | .60 | -14.29% |
| 1989 | 1.00 | 66.67% |
| 1990 | .70 | -30.00% |
| 1991 | .60 | -14.29% |
| 1992 | .80 | 33.33% |
| 1993 | 1.20 | 50.00% |
| 1994 | .90 | -25.00% |
| 1995 | .50 | -44.44% |
| 1996 | .50 | 0.00% |
| 1997 | .60 | 20.00% |
| 1998 | .60 | 0.00% |
| 1999 | .50 | -16.67% |
| 2000 | .60 | 20.00% |
| 2001 | .60 | 0.00% |
| 2002 | .60 | 0.00% |
| 2003 | 1.00 | 66.67% |
| 2004 | 1.00 | 0.00% |
| 2005 | .60 | -40.00% |
| 2006 | .60 | 0.00% |
| 2007 | .70 | 16.67% |
| 2008 | .90 | 28.57% |
| 2009 | .80 | -11.11% |
| 2010 | .80 | 0.00% |
| 2011 | .90 | 12.50% |
| 2012 | 1.00 | 11.11% |
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