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| year | consumption | change |
| 1986 | 1.50 | NA |
| 1987 | .40 | -73.33% |
| 1988 | 1.30 | 225.00% |
| 1989 | 1.20 | -7.69% |
| 1990 | 1.40 | 16.67% |
| 1991 | 1.70 | 21.43% |
| 1992 | 1.80 | 5.88% |
| 1993 | 1.40 | -22.22% |
| 1994 | 1.90 | 35.71% |
| 1995 | 1.90 | 0.00% |
| 1996 | 2.00 | 5.26% |
| 1997 | 1.80 | -10.00% |
| 1998 | 1.30 | -27.78% |
| 1999 | 1.10 | -15.38% |
| 2000 | .50 | -54.55% |
| 2001 | .60 | 20.00% |
| 2002 | .60 | 0.00% |
| 2003 | .50 | -16.67% |
| 2004 | .50 | 0.00% |
| 2005 | .60 | 20.00% |
| 2006 | .40 | -33.33% |
| 2007 | .50 | 25.00% |
| 2008 | .60 | 20.00% |
| 2009 | .40 | -33.33% |
| 2010 | .70 | 75.00% |
| 2011 | .70 | 0.00% |
| 2012 | .70 | 0.00% |
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