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| year | consumption | change |
| 1980 | .01 | NA |
| 1981 | .01 | 0.00 % |
| 1982 | .01 | 22.22 % |
| 1983 | .01 | 0.00 % |
| 1984 | .01 | 36.36 % |
| 1985 | .01 | 0.00 % |
| 1986 | .01 | -6.67 % |
| 1987 | .01 | 7.14 % |
| 1988 | .01 | 0.00 % |
| 1989 | .01 | 0.00 % |
| 1990 | .01 | 0.00 % |
| 1991 | .01 | 0.00 % |
| 1992 | .01 | 0.00 % |
| 1993 | .01 | 0.00 % |
| 1994 | .02 | 20.00 % |
| 1995 | .02 | 5.56 % |
| 1996 | .02 | 5.26 % |
| 1997 | .02 | 5.00 % |
| 1998 | .02 | 4.76 % |
| 1999 | .02 | 18.18 % |
| 2000 | .03 | 7.69 % |
| 2001 | .02 | -14.29 % |
| 2002 | .03 | 25.00 % |
| 2003 | .03 | 3.33 % |
| 2004 | .03 | 12.90 % |
| 2005 | .04 | 11.43 % |
| 2006 | .04 | 2.56 % |
| 2007 | .04 | 7.50 % |
| 2008 | .04 | 4.65 % |
| 2009 | .05 | 8.89 % |
| 2010 | .05 | 10.20 % |
| 2011 | .06 | 11.11 % |
| 2012 | .06 | 8.33 % |
| 2013 | .06 | 1.54 % |
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