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| year | consumption | change |
| 1980 | .03 | NA |
| 1981 | .03 | -3.57% |
| 1982 | .02 | -22.22% |
| 1983 | .02 | -14.29% |
| 1984 | .02 | 22.22% |
| 1985 | .02 | 4.55% |
| 1986 | .02 | -4.35% |
| 1987 | .02 | 0.00% |
| 1988 | .02 | 9.09% |
| 1989 | .03 | 8.33% |
| 1990 | .03 | -3.85% |
| 1991 | .03 | 0.00% |
| 1992 | .03 | 4.00% |
| 1993 | .03 | 0.00% |
| 1994 | .03 | 0.00% |
| 1995 | .03 | 0.00% |
| 1996 | .03 | 3.85% |
| 1997 | .03 | -7.41% |
| 1998 | .03 | 4.00% |
| 1999 | .03 | 3.85% |
| 2000 | .03 | 11.11% |
| 2001 | .03 | -3.33% |
| 2002 | .03 | 10.34% |
| 2003 | .03 | 3.13% |
| 2004 | .04 | 6.06% |
| 2005 | .04 | 0.00% |
| 2006 | .04 | 17.14% |
| 2007 | .04 | 0.00% |
| 2008 | .04 | 0.00% |
| 2009 | .04 | 2.44% |
| 2010 | .04 | 0.00% |
| 2011 | .04 | 4.76% |
| 2012 | .04 | -2.27% |
| 2013 | .04 | -18.60% |
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