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| year | consumption | change |
| 1980 | .01 | NA |
| 1981 | .02 | 150.00% |
| 1982 | .01 | -6.67% |
| 1983 | .01 | 0.00% |
| 1984 | .01 | 0.00% |
| 1985 | .02 | 35.71% |
| 1986 | .02 | 5.26% |
| 1987 | .02 | 5.00% |
| 1988 | .03 | 19.05% |
| 1989 | .03 | 12.00% |
| 1990 | .03 | 17.86% |
| 1991 | .03 | 3.03% |
| 1992 | .04 | 14.71% |
| 1993 | .04 | 0.00% |
| 1994 | .04 | 2.56% |
| 1995 | .04 | 7.50% |
| 1996 | .04 | -6.98% |
| 1997 | .04 | 5.00% |
| 1998 | .05 | 11.90% |
| 1999 | .05 | 4.26% |
| 2000 | .06 | 18.37% |
| 2001 | .05 | -8.62% |
| 2002 | .05 | 0.00% |
| 2003 | .05 | -5.66% |
| 2004 | .06 | 16.00% |
| 2005 | .06 | 5.17% |
| 2006 | .07 | 8.20% |
| 2007 | .06 | -4.55% |
| 2008 | .08 | 20.63% |
| 2009 | .07 | -14.47% |
| 2010 | .07 | 13.85% |
| 2011 | .07 | -12.16% |
| 2012 | .06 | -3.08% |
| 2013 | .06 | -1.59% |
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