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| year | consumption | change |
| 1980 | .05 | NA |
| 1981 | .05 | 7.41% |
| 1982 | .05 | -1.72% |
| 1983 | .06 | 12.28% |
| 1984 | .06 | 0.00% |
| 1985 | .06 | 6.25% |
| 1986 | .07 | 2.94% |
| 1987 | .07 | 7.14% |
| 1988 | .09 | 29.33% |
| 1989 | .09 | 0.00% |
| 1990 | .09 | 1.03% |
| 1991 | .09 | 1.02% |
| 1992 | .10 | 8.61% |
| 1993 | .10 | 0.00% |
| 1994 | .20 | 100.00% |
| 1995 | .20 | 0.00% |
| 1996 | .20 | 0.00% |
| 1997 | .20 | 0.00% |
| 1998 | .20 | 0.00% |
| 1999 | .20 | 0.00% |
| 2000 | .20 | 0.00% |
| 2001 | .30 | 50.00% |
| 2002 | .20 | -33.33% |
| 2003 | .30 | 50.00% |
| 2004 | .30 | 0.00% |
| 2005 | .30 | 0.00% |
| 2006 | .30 | 0.00% |
| 2007 | .30 | 0.00% |
| 2008 | .30 | 0.00% |
| 2009 | .30 | 0.00% |
| 2010 | .30 | 0.00% |
| 2011 | .30 | 0.00% |
| 2012 | .30 | 0.00% |
| 2013 | .30 | 0.00% |
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