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| year | consumption | change |
| 1980 | .07 | NA |
| 1981 | .06 | -4.29% |
| 1982 | .06 | 0.00% |
| 1983 | .07 | 5.97% |
| 1984 | .06 | -2.82% |
| 1985 | .08 | 20.29% |
| 1986 | .07 | -9.64% |
| 1987 | .08 | 8.00% |
| 1988 | .08 | 12.35% |
| 1989 | .08 | -1.10% |
| 1990 | .09 | 4.44% |
| 1991 | .09 | 8.51% |
| 1992 | .09 | 0.00% |
| 1993 | .10 | 5.42% |
| 1994 | .10 | 0.00% |
| 1995 | .10 | 0.00% |
| 1996 | .10 | 0.00% |
| 1997 | .10 | 0.00% |
| 1998 | .10 | 0.00% |
| 1999 | .10 | 0.00% |
| 2000 | .10 | 0.00% |
| 2001 | .10 | 0.00% |
| 2002 | .20 | 100.00% |
| 2003 | .20 | 0.00% |
| 2004 | .20 | 0.00% |
| 2005 | .20 | 0.00% |
| 2006 | .20 | 0.00% |
| 2007 | .20 | 0.00% |
| 2008 | .20 | 0.00% |
| 2009 | .20 | 0.00% |
| 2010 | .10 | -50.00% |
| 2011 | .10 | 0.00% |
| 2012 | .10 | 0.00% |
| 2013 | .10 | 0.00% |
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