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| year | consumption | change |
| 1980 | .02 | NA |
| 1981 | .02 | 10.53 % |
| 1982 | .02 | -4.76 % |
| 1983 | .02 | 10.00 % |
| 1984 | .02 | 5.68 % |
| 1985 | .02 | -1.08 % |
| 1986 | .03 | 13.04 % |
| 1987 | .03 | 19.23 % |
| 1988 | .04 | 19.35 % |
| 1989 | .04 | 13.51 % |
| 1990 | .05 | 7.14 % |
| 1991 | .05 | 11.11 % |
| 1992 | .05 | 6.00 % |
| 1993 | .06 | 3.77 % |
| 1994 | .06 | 9.09 % |
| 1995 | .08 | 35.00 % |
| 1996 | .09 | 6.17 % |
| 1997 | .09 | 5.81 % |
| 1998 | .10 | 9.89 % |
| 1999 | .10 | 0.00 % |
| 2000 | .10 | 0.00 % |
| 2001 | .10 | 0.00 % |
| 2002 | .10 | 0.00 % |
| 2003 | .10 | 0.00 % |
| 2004 | .10 | 0.00 % |
| 2005 | .10 | 0.00 % |
| 2006 | .20 | 100.00 % |
| 2007 | .20 | 0.00 % |
| 2008 | .20 | 0.00 % |
| 2009 | .20 | 0.00 % |
| 2010 | .20 | 0.00 % |
| 2011 | .20 | 0.00 % |
| 2012 | .20 | 0.00 % |
| 2013 | .20 | 0.00 % |
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