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| year | consumption | change |
| 1980 | .20 | NA |
| 1981 | .20 | 0.00% |
| 1982 | .20 | 0.00% |
| 1983 | .20 | 0.00% |
| 1984 | .20 | 0.00% |
| 1985 | .20 | 0.00% |
| 1986 | .10 | -50.00% |
| 1987 | .10 | 0.00% |
| 1988 | .10 | 0.00% |
| 1989 | .20 | 100.00% |
| 1990 | .20 | 0.00% |
| 1991 | .20 | 0.00% |
| 1992 | .20 | 0.00% |
| 1993 | .20 | 0.00% |
| 1994 | .20 | 0.00% |
| 1995 | .08 | -58.15% |
| 1996 | .10 | 19.47% |
| 1997 | .08 | -16.30% |
| 1998 | .10 | 14.44% |
| 1999 | .06 | -33.98% |
| 2000 | .08 | 30.88% |
| 2001 | .10 | 20.82% |
| 2002 | .10 | 0.00% |
| 2003 | .10 | 0.00% |
| 2004 | .10 | 0.00% |
| 2005 | .07 | -27.46% |
| 2006 | .04 | -50.00% |
| 2007 | .05 | 46.15% |
| 2008 | .10 | 88.64% |
| 2009 | .10 | 0.00% |
| 2010 | .20 | 100.00% |
| 2011 | .10 | -50.00% |
| 2012 | .20 | 100.00% |
| 2013 | .20 | 0.00% |
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