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| year | consumption | change |
| 1986 | 1.00 | NA |
| 1987 | 1.20 | 20.00% |
| 1988 | 1.00 | -16.67% |
| 1989 | 1.00 | 0.00% |
| 1990 | 1.00 | 0.00% |
| 1991 | 1.00 | 0.00% |
| 1992 | 1.00 | 0.00% |
| 1993 | 1.00 | 0.00% |
| 1994 | .90 | -10.00% |
| 1995 | 1.00 | 11.11% |
| 1996 | 1.00 | 0.00% |
| 1997 | 1.30 | 30.00% |
| 1998 | 1.70 | 30.77% |
| 1999 | 2.20 | 29.41% |
| 2000 | 1.90 | -13.64% |
| 2001 | 2.70 | 42.11% |
| 2002 | 1.50 | -44.44% |
| 2003 | 1.20 | -20.00% |
| 2004 | .30 | -75.00% |
| 2007 | .10 | -66.67% |
| 2008 | .00 | -100.00% |
| 2009 | .00 | NA |
| 2010 | .00 | NA |
| 2011 | .00 | NA |
| 2012 | .00 | NA |
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