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| year | consumption | change |
| 1980 | 1.00 | NA |
| 1981 | 1.00 | 0.00% |
| 1982 | .90 | -10.00% |
| 1983 | 1.00 | 11.11% |
| 1984 | 1.00 | 0.00% |
| 1985 | .90 | -10.00% |
| 1986 | 1.10 | 22.22% |
| 1987 | 1.40 | 27.27% |
| 1988 | 1.50 | 7.14% |
| 1989 | 1.70 | 13.33% |
| 1990 | 1.70 | 0.00% |
| 1991 | 1.60 | -5.88% |
| 1992 | 1.50 | -6.25% |
| 1993 | .80 | -46.67% |
| 1994 | .90 | 12.50% |
| 1995 | .60 | -33.33% |
| 1996 | .60 | 0.00% |
| 1997 | .40 | -33.33% |
| 1998 | .50 | 25.00% |
| 1999 | .50 | 0.00% |
| 2000 | .50 | 0.00% |
| 2001 | .50 | 0.00% |
| 2002 | .50 | 0.00% |
| 2003 | .50 | 0.00% |
| 2004 | .50 | 0.00% |
| 2005 | .60 | 20.00% |
| 2006 | .60 | 0.00% |
| 2007 | .60 | 0.00% |
| 2008 | .60 | 0.00% |
| 2009 | .60 | 0.00% |
| 2010 | .60 | 0.00% |
| 2011 | .60 | 0.00% |
| 2012 | .60 | 0.00% |
| 2013 | .60 | 0.00% |
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