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| year | consumption | change |
| 1986 | 1.70 | NA |
| 1987 | 1.50 | -11.76% |
| 1988 | 1.60 | 6.67% |
| 1989 | 1.50 | -6.25% |
| 1990 | 1.00 | -33.33% |
| 1991 | .20 | -80.00% |
| 1992 | .70 | 250.00% |
| 1993 | 1.10 | 57.14% |
| 1994 | .60 | -45.45% |
| 1995 | .60 | 0.00% |
| 1996 | 1.50 | 150.00% |
| 1997 | 1.20 | -20.00% |
| 1998 | 1.40 | 16.67% |
| 1999 | 1.60 | 14.29% |
| 2000 | 1.60 | 0.00% |
| 2001 | .10 | -93.75% |
| 2002 | .20 | 100.00% |
| 2003 | .10 | -50.00% |
| 2004 | .10 | 0.00% |
| 2005 | .20 | 100.00% |
| 2006 | .20 | 0.00% |
| 2007 | .20 | 0.00% |
| 2008 | .20 | 0.00% |
| 2009 | .20 | 0.00% |
| 2010 | .00 | -100.00% |
| 2011 | .00 | NA |
| 2012 | .00 | NA |
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