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| year | consumption | change |
| 1980 | .02 | NA |
| 1981 | .02 | 10.53% |
| 1982 | .02 | 4.76% |
| 1983 | .02 | -27.27% |
| 1984 | .02 | 37.50% |
| 1985 | .02 | -18.18% |
| 1986 | .02 | 16.67% |
| 1987 | .02 | 14.29% |
| 1988 | .03 | 8.33% |
| 1989 | .03 | 11.54% |
| 1990 | .03 | 3.45% |
| 1991 | .03 | 3.33% |
| 1992 | .03 | 0.00% |
| 1993 | .04 | 16.13% |
| 1994 | .04 | 0.00% |
| 1995 | .03 | -5.56% |
| 1996 | .04 | 2.94% |
| 1997 | .04 | 5.71% |
| 1998 | .04 | 5.41% |
| 1999 | .05 | 15.38% |
| 2000 | .04 | -13.33% |
| 2001 | .03 | -15.38% |
| 2002 | .04 | 18.18% |
| 2003 | .04 | 0.00% |
| 2004 | .04 | 2.56% |
| 2005 | .04 | 2.50% |
| 2006 | .04 | -4.88% |
| 2007 | .04 | 5.13% |
| 2008 | .08 | 90.24% |
| 2009 | .09 | 12.82% |
| 2010 | .11 | 19.32% |
| 2011 | .09 | -10.48% |
| 2012 | .09 | 0.00% |
| 2013 | .08 | -13.83% |
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