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| year | consumption | change |
| 1980 | .01 | NA |
| 1981 | .01 | 0.00% |
| 1982 | .02 | 40.00% |
| 1983 | .02 | 4.76% |
| 1984 | .02 | 18.18% |
| 1985 | .03 | 3.85% |
| 1986 | .03 | 3.70% |
| 1987 | .03 | 10.71% |
| 1988 | .03 | 6.45% |
| 1989 | .03 | 0.00% |
| 1990 | .04 | 18.18% |
| 1991 | .05 | 28.21% |
| 1992 | .05 | 14.00% |
| 1993 | .06 | 15.79% |
| 1994 | .07 | 13.64% |
| 1995 | .07 | 4.00% |
| 1996 | .08 | 6.41% |
| 1997 | .08 | 6.02% |
| 1998 | .09 | 9.09% |
| 1999 | .10 | 12.01% |
| 2000 | .10 | 0.00% |
| 2001 | .10 | 0.00% |
| 2002 | .20 | 100.00% |
| 2003 | .20 | 0.00% |
| 2004 | .20 | 0.00% |
| 2005 | .20 | 0.00% |
| 2006 | .20 | 0.00% |
| 2007 | .20 | 0.00% |
| 2008 | .30 | 50.00% |
| 2009 | .30 | 0.00% |
| 2010 | .30 | 0.00% |
| 2011 | .30 | 0.00% |
| 2012 | .30 | 0.00% |
| 2013 | .20 | -33.33% |
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