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| year | consumption | change |
| 1986 | 1.60 | NA |
| 1987 | .60 | -62.50% |
| 1988 | 3.00 | 400.00% |
| 1989 | 2.10 | -30.00% |
| 1990 | 2.50 | 19.05% |
| 1991 | 3.60 | 44.00% |
| 1992 | 4.00 | 11.11% |
| 1993 | .20 | -95.00% |
| 1994 | 2.80 | 1,300.00% |
| 1995 | 4.90 | 75.00% |
| 1996 | 6.80 | 38.78% |
| 1997 | .20 | -97.06% |
| 1998 | 6.20 | 3,000.00% |
| 1999 | .20 | -96.77% |
| 2000 | .20 | 0.00% |
| 2001 | .20 | 0.00% |
| 2002 | .20 | 0.00% |
| 2003 | .30 | 50.00% |
| 2004 | .40 | 33.33% |
| 2005 | .20 | -50.00% |
| 2006 | .20 | 0.00% |
| 2007 | .10 | -50.00% |
| 2010 | .00 | -100.00% |
| 2011 | .00 | NA |
| 2012 | .00 | NA |
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