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| year | consumption | change |
| 1986 | .20 | NA |
| 1987 | .40 | 100.00% |
| 1988 | .60 | 50.00% |
| 1989 | .50 | -16.67% |
| 1990 | .60 | 20.00% |
| 1991 | 2.10 | 250.00% |
| 1992 | 3.00 | 42.86% |
| 1993 | 2.60 | -13.33% |
| 1994 | 2.40 | -7.69% |
| 1995 | 1.20 | -50.00% |
| 1996 | .70 | -41.67% |
| 1997 | .30 | -57.14% |
| 1998 | .30 | 0.00% |
| 1999 | .20 | -33.33% |
| 2001 | .20 | 0.00% |
| 2002 | .20 | 0.00% |
| 2004 | .00 | -100.00% |
| 2005 | .00 | NA |
| 2006 | .00 | NA |
| 2007 | .00 | NA |
| 2008 | .00 | NA |
| 2010 | .00 | NA |
| 2012 | .00 | NA |
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