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| year | consumption | change |
| 1980 | .00 | NA |
| 1981 | .10 | NA |
| 1982 | .30 | 200.00% |
| 1983 | .30 | 0.00% |
| 1984 | .40 | 33.33% |
| 1985 | .30 | -25.00% |
| 1986 | .20 | -33.33% |
| 1987 | .50 | 150.00% |
| 1988 | .60 | 20.00% |
| 1989 | .50 | -16.67% |
| 1990 | .50 | 0.00% |
| 1991 | .60 | 20.00% |
| 1992 | .60 | 0.00% |
| 1993 | .60 | 0.00% |
| 1994 | .40 | -33.33% |
| 1995 | .20 | -50.00% |
| 1996 | .10 | -50.00% |
| 1997 | .10 | 0.00% |
| 1998 | .10 | 0.00% |
| 1999 | .20 | 100.00% |
| 2004 | .00 | -100.00% |
| 2005 | .60 | NA |
| 2006 | .80 | 33.33% |
| 2007 | 1.00 | 25.00% |
| 2008 | 1.40 | 40.00% |
| 2009 | 1.90 | 35.71% |
| 2010 | 2.20 | 15.79% |
| 2011 | 2.60 | 18.18% |
| 2012 | 2.60 | 0.00% |
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