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| year | consumption | change |
| 1986 | 1.00 | NA |
| 1987 | 1.60 | 60.00% |
| 1988 | 1.30 | -18.75% |
| 1989 | .50 | -61.54% |
| 1990 | 1.10 | 120.00% |
| 1991 | 1.20 | 9.09% |
| 1992 | .80 | -33.33% |
| 1993 | .20 | -75.00% |
| 1994 | .10 | -50.00% |
| 1995 | .30 | 200.00% |
| 1996 | .40 | 33.33% |
| 1997 | 1.80 | 350.00% |
| 1998 | .80 | -55.56% |
| 1999 | .60 | -25.00% |
| 2000 | .30 | -50.00% |
| 2001 | .30 | 0.00% |
| 2002 | .30 | 0.00% |
| 2003 | .40 | 33.33% |
| 2004 | .20 | -50.00% |
| 2005 | .20 | 0.00% |
| 2006 | .20 | 0.00% |
| 2007 | .50 | 150.00% |
| 2008 | .50 | 0.00% |
| 2009 | .20 | -60.00% |
| 2010 | .10 | -50.00% |
| 2011 | .20 | 100.00% |
| 2012 | .60 | 200.00% |
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