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| year | consumption | change |
| 1980 | .01 | NA |
| 1981 | .01 | -15.38% |
| 1982 | .01 | 9.09% |
| 1983 | .01 | -8.33% |
| 1984 | .01 | -9.09% |
| 1985 | .01 | -10.00% |
| 1986 | .01 | 11.11% |
| 1987 | .01 | -20.00% |
| 1988 | .01 | -12.50% |
| 1989 | .01 | 28.57% |
| 1990 | .01 | 11.11% |
| 1991 | .01 | 10.00% |
| 1992 | .01 | 0.00% |
| 1993 | .01 | 0.00% |
| 1994 | .01 | 0.00% |
| 1995 | .01 | 27.27% |
| 1996 | .02 | 14.29% |
| 1997 | .02 | 6.25% |
| 1998 | .02 | 35.29% |
| 1999 | .03 | 21.74% |
| 2000 | .03 | 21.43% |
| 2001 | .04 | 2.94% |
| 2002 | .04 | 2.86% |
| 2003 | .03 | -8.33% |
| 2004 | .04 | 12.12% |
| 2005 | .04 | 2.70% |
| 2006 | .04 | 5.26% |
| 2007 | .04 | 7.50% |
| 2008 | .05 | 9.30% |
| 2009 | .05 | -2.13% |
| 2010 | .07 | 60.87% |
| 2011 | .10 | 31.08% |
| 2012 | .09 | -3.09% |
| 2013 | .11 | 18.09% |
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