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| year | consumption | change |
| 1980 | .18 | NA |
| 1981 | .07 | -61.71% |
| 1982 | .06 | -4.48% |
| 1983 | .09 | 34.38% |
| 1984 | .03 | -60.47% |
| 1985 | .03 | -2.94% |
| 1986 | .02 | -48.48% |
| 1987 | .02 | 0.00% |
| 1988 | .03 | 47.06% |
| 1989 | .02 | -20.00% |
| 1990 | .02 | 0.00% |
| 1991 | .02 | 5.00% |
| 1992 | .02 | -4.76% |
| 1993 | .02 | 10.00% |
| 1994 | .02 | -4.55% |
| 1995 | .02 | 4.76% |
| 1996 | .02 | 0.00% |
| 1997 | .03 | 18.18% |
| 1998 | .03 | 23.08% |
| 1999 | .08 | 143.75% |
| 2000 | .10 | 29.49% |
| 2001 | .13 | 29.70% |
| 2002 | .13 | 1.53% |
| 2003 | .13 | -1.50% |
| 2004 | .14 | 8.40% |
| 2005 | .16 | 9.86% |
| 2006 | .17 | 7.69% |
| 2007 | .18 | 8.33% |
| 2008 | .17 | -6.59% |
| 2009 | .18 | 7.65% |
| 2010 | .19 | 1.09% |
| 2011 | .21 | 11.89% |
| 2012 | .18 | -14.01% |
| 2013 | .19 | 7.30% |
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