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| year | consumption | change |
| 1980 | .02 | NA |
| 1981 | .02 | 14.29% |
| 1982 | .02 | -16.67% |
| 1983 | .02 | -15.00% |
| 1984 | .02 | 17.65% |
| 1985 | .02 | 0.00% |
| 1986 | .02 | -5.00% |
| 1987 | .02 | -21.05% |
| 1988 | .02 | 0.00% |
| 1989 | .01 | -33.33% |
| 1990 | .01 | -10.00% |
| 1991 | .01 | 22.22% |
| 1992 | .01 | 9.09% |
| 1993 | .02 | 25.00% |
| 1994 | .02 | 6.67% |
| 1995 | .01 | -18.75% |
| 1996 | .01 | 7.69% |
| 1997 | .02 | 14.29% |
| 1998 | .02 | 25.00% |
| 1999 | .02 | 5.00% |
| 2000 | .02 | 9.52% |
| 2001 | .02 | 4.35% |
| 2002 | .02 | 0.00% |
| 2003 | .02 | -4.17% |
| 2004 | .02 | -8.70% |
| 2005 | .02 | 9.52% |
| 2006 | .02 | -4.35% |
| 2007 | .02 | 0.00% |
| 2008 | .02 | 4.55% |
| 2009 | .02 | 0.00% |
| 2010 | .02 | -4.35% |
| 2011 | .02 | 4.55% |
| 2012 | .02 | 0.00% |
| 2013 | .02 | -4.35% |
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