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| year | consumption | change |
| 1980 | .01 | NA |
| 1981 | .01 | -14.29% |
| 1982 | .01 | 0.00% |
| 1983 | .01 | 0.00% |
| 1984 | .01 | 8.33% |
| 1985 | .01 | 7.69% |
| 1986 | .02 | 28.57% |
| 1987 | .02 | -11.11% |
| 1988 | .02 | 31.25% |
| 1989 | .03 | 19.05% |
| 1990 | .03 | 8.00% |
| 1991 | .03 | 3.70% |
| 1992 | .03 | 17.86% |
| 1993 | .03 | 0.00% |
| 1994 | .03 | 0.00% |
| 1995 | .04 | 9.09% |
| 1996 | .04 | -2.78% |
| 1997 | .04 | 2.86% |
| 1998 | .04 | 2.78% |
| 1999 | .04 | 10.81% |
| 2000 | .05 | 29.27% |
| 2001 | .06 | 11.32% |
| 2002 | .05 | -8.47% |
| 2003 | .06 | 5.56% |
| 2004 | .06 | 1.75% |
| 2005 | .06 | 3.45% |
| 2006 | .06 | 6.67% |
| 2007 | .07 | 6.25% |
| 2008 | .07 | 4.41% |
| 2009 | .06 | -9.86% |
| 2010 | .07 | 12.50% |
| 2011 | .07 | 1.39% |
| 2012 | .07 | 1.37% |
| 2013 | .08 | 1.35% |
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