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| year | consumption | change |
| 1980 | .01 | NA |
| 1981 | .01 | 0.00% |
| 1982 | .01 | -28.57% |
| 1983 | .01 | 40.00% |
| 1984 | .01 | 0.00% |
| 1985 | .01 | 14.29% |
| 1986 | .01 | 0.00% |
| 1987 | .01 | -25.00% |
| 1988 | .01 | 16.67% |
| 1989 | .01 | 14.29% |
| 1990 | .01 | 12.50% |
| 1991 | .01 | 11.11% |
| 1992 | .01 | 10.00% |
| 1993 | .01 | 9.09% |
| 1994 | .01 | 8.33% |
| 1995 | .01 | 7.69% |
| 1996 | .02 | 7.14% |
| 1997 | .02 | 13.33% |
| 1998 | .02 | 5.88% |
| 1999 | .02 | 11.11% |
| 2000 | .02 | 20.00% |
| 2001 | .02 | 0.00% |
| 2002 | .03 | 8.33% |
| 2003 | .03 | 19.23% |
| 2004 | .04 | 16.13% |
| 2005 | .04 | 2.78% |
| 2006 | .04 | 18.92% |
| 2007 | .05 | 9.09% |
| 2008 | .05 | 10.42% |
| 2009 | .07 | 24.53% |
| 2010 | .07 | 12.12% |
| 2011 | .07 | -10.81% |
| 2012 | .07 | 0.00% |
| 2013 | .07 | 12.12% |
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