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| year | consumption | change |
| 1980 | .06 | NA |
| 1981 | .06 | 5.00% |
| 1982 | .05 | -14.29% |
| 1983 | .04 | -24.07% |
| 1984 | .04 | -9.76% |
| 1985 | .03 | -10.81% |
| 1986 | .03 | 0.00% |
| 1987 | .04 | 9.09% |
| 1988 | .03 | -5.56% |
| 1989 | .04 | 11.76% |
| 1990 | .04 | 7.89% |
| 1991 | .04 | -9.76% |
| 1992 | .03 | -16.22% |
| 1993 | .03 | 6.45% |
| 1994 | .04 | 9.09% |
| 1995 | .04 | 19.44% |
| 1996 | .05 | 11.63% |
| 1997 | .05 | 0.00% |
| 1998 | .05 | 12.50% |
| 1999 | .05 | -11.11% |
| 2000 | .05 | -2.08% |
| 2001 | .05 | 0.00% |
| 2002 | .05 | 0.00% |
| 2003 | .06 | 21.28% |
| 2004 | .06 | 0.00% |
| 2005 | .07 | 15.79% |
| 2006 | .07 | 0.00% |
| 2007 | .06 | -4.55% |
| 2008 | .04 | -31.75% |
| 2009 | .05 | 13.95% |
| 2010 | .05 | 0.00% |
| 2011 | .05 | 0.00% |
| 2012 | .05 | 0.00% |
| 2013 | .05 | 8.16% |
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