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| year | consumption | change |
| 1980 | .08 | NA |
| 1981 | .09 | 7.87 % |
| 1982 | .09 | 4.17 % |
| 1983 | .09 | 1.00 % |
| 1984 | .09 | -1.98 % |
| 1985 | .10 | 4.04 % |
| 1986 | .10 | 0.97 % |
| 1987 | .10 | 3.39 % |
| 1988 | .10 | 0.00 % |
| 1989 | .10 | 0.00 % |
| 1990 | .10 | 0.00 % |
| 1991 | .10 | 0.00 % |
| 1992 | .10 | 0.00 % |
| 1993 | .10 | 0.00 % |
| 1994 | .10 | 0.00 % |
| 1995 | .10 | 0.00 % |
| 1996 | .20 | 100.00 % |
| 1997 | .20 | 0.00 % |
| 1998 | .20 | 0.00 % |
| 1999 | .20 | 0.00 % |
| 2000 | .20 | 0.00 % |
| 2001 | .30 | 50.00 % |
| 2002 | .50 | 66.67 % |
| 2003 | .40 | -20.00 % |
| 2004 | .50 | 25.00 % |
| 2005 | .50 | 0.00 % |
| 2006 | .40 | -20.00 % |
| 2007 | .40 | 0.00 % |
| 2008 | .50 | 25.00 % |
| 2009 | .50 | 0.00 % |
| 2010 | .60 | 20.00 % |
| 2011 | .60 | 0.00 % |
| 2012 | .70 | 16.67 % |
| 2013 | .70 | 0.00 % |
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