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| year | consumption | change |
| 1986 | 1.00 | NA |
| 1987 | 1.10 | 10.00% |
| 1988 | .80 | -27.27% |
| 1989 | .90 | 12.50% |
| 1990 | 1.00 | 11.11% |
| 1991 | 1.40 | 40.00% |
| 1992 | 2.20 | 57.14% |
| 1993 | 1.20 | -45.45% |
| 1994 | 1.20 | 0.00% |
| 1995 | 1.20 | 0.00% |
| 1996 | 1.10 | -8.33% |
| 1997 | 1.00 | -9.09% |
| 1998 | .90 | -10.00% |
| 1999 | .90 | 0.00% |
| 2000 | .80 | -11.11% |
| 2001 | .70 | -12.50% |
| 2002 | 1.00 | 42.86% |
| 2003 | .60 | -40.00% |
| 2004 | .90 | 50.00% |
| 2005 | 1.00 | 11.11% |
| 2006 | .90 | -10.00% |
| 2007 | 1.70 | 88.89% |
| 2008 | .70 | -58.82% |
| 2009 | .40 | -42.86% |
| 2010 | .90 | 125.00% |
| 2011 | .40 | -55.56% |
| 2012 | .90 | 125.00% |
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