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| year | consumption | change |
| 1980 | .00 | NA |
| 1981 | .00 | 25.00% |
| 1982 | .01 | 20.00% |
| 1983 | .01 | 16.67% |
| 1984 | .01 | 28.57% |
| 1985 | .01 | 44.44% |
| 1986 | .01 | 15.38% |
| 1987 | .02 | 20.00% |
| 1988 | .02 | 5.56% |
| 1989 | .02 | 5.26% |
| 1990 | .02 | 15.00% |
| 1991 | .02 | 13.04% |
| 1992 | .03 | 7.69% |
| 1993 | .04 | 35.71% |
| 1994 | .04 | 13.16% |
| 1995 | .05 | 25.58% |
| 1996 | .05 | 9.26% |
| 1997 | .06 | 13.56% |
| 1998 | .07 | 14.93% |
| 1999 | .08 | 12.99% |
| 2000 | .09 | 12.64% |
| 2001 | .10 | 9.72% |
| 2002 | .10 | 0.00% |
| 2003 | .10 | 0.00% |
| 2004 | .10 | 0.00% |
| 2005 | .20 | 100.00% |
| 2006 | .20 | 0.00% |
| 2007 | .20 | 0.00% |
| 2008 | .20 | 0.00% |
| 2009 | .30 | 50.00% |
| 2010 | .20 | -33.33% |
| 2011 | .20 | 0.00% |
| 2012 | .30 | 50.00% |
| 2013 | .30 | 0.00% |
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