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| year | consumption | change |
| 1980 | .03 | NA |
| 1981 | .03 | -9.38% |
| 1982 | .03 | 3.45% |
| 1983 | .03 | -3.33% |
| 1984 | .03 | -10.34% |
| 1985 | .03 | 0.00% |
| 1986 | .02 | -19.23% |
| 1987 | .02 | -19.05% |
| 1988 | .02 | 23.53% |
| 1989 | .02 | -19.05% |
| 1990 | .01 | -52.94% |
| 1991 | .01 | -37.50% |
| 1992 | .01 | 0.00% |
| 1993 | .01 | 0.00% |
| 1994 | .01 | 0.00% |
| 1995 | .01 | 0.00% |
| 1996 | .01 | 20.00% |
| 1997 | .01 | 0.00% |
| 1998 | .01 | 0.00% |
| 1999 | .01 | 0.00% |
| 2000 | .01 | 0.00% |
| 2001 | .01 | 16.67% |
| 2002 | .01 | 0.00% |
| 2003 | .01 | 0.00% |
| 2004 | .01 | 0.00% |
| 2005 | .01 | 0.00% |
| 2006 | .01 | 28.57% |
| 2007 | .01 | 0.00% |
| 2008 | .01 | 0.00% |
| 2009 | .01 | -11.11% |
| 2010 | .01 | 0.00% |
| 2011 | .01 | 0.00% |
| 2012 | .01 | 0.00% |
| 2013 | .01 | 0.00% |
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