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| year | consumption | change |
| 1980 | .02 | NA |
| 1981 | .02 | 6.67% |
| 1982 | .02 | -6.25% |
| 1983 | .01 | -13.33% |
| 1984 | .02 | 15.38% |
| 1985 | .02 | 0.00% |
| 1986 | .02 | 20.00% |
| 1987 | .02 | -16.67% |
| 1988 | .02 | 0.00% |
| 1989 | .02 | 13.33% |
| 1990 | .02 | 11.76% |
| 1991 | .02 | -15.79% |
| 1992 | .02 | 6.25% |
| 1993 | .02 | 0.00% |
| 1994 | .02 | 5.88% |
| 1995 | .02 | 5.56% |
| 1996 | .02 | 5.26% |
| 1997 | .02 | 0.00% |
| 1998 | .02 | -5.00% |
| 1999 | .02 | 10.53% |
| 2000 | .02 | 14.29% |
| 2001 | .03 | 8.33% |
| 2002 | .03 | 15.38% |
| 2003 | .04 | 23.33% |
| 2004 | .04 | 8.11% |
| 2005 | .04 | -2.50% |
| 2006 | .04 | 5.13% |
| 2007 | .04 | -2.44% |
| 2008 | .04 | -10.00% |
| 2009 | .02 | -33.33% |
| 2010 | .02 | -4.17% |
| 2011 | .02 | 4.35% |
| 2012 | .02 | 0.00% |
| 2013 | .03 | 16.67% |
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