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| year | consumption | change |
| 1980 | .01 | NA |
| 1981 | .01 | 9.09% |
| 1982 | .01 | -8.33% |
| 1983 | .02 | 63.64% |
| 1984 | .02 | 33.33% |
| 1985 | .02 | 0.00% |
| 1986 | .02 | 8.33% |
| 1987 | .03 | 3.85% |
| 1988 | .03 | 3.70% |
| 1989 | .03 | 3.57% |
| 1990 | .03 | 0.00% |
| 1991 | .03 | 3.45% |
| 1992 | .03 | 0.00% |
| 1993 | .03 | 0.00% |
| 1994 | .03 | 10.00% |
| 1995 | .04 | 33.33% |
| 1996 | .04 | -4.55% |
| 1997 | .05 | 19.05% |
| 1998 | .06 | 24.00% |
| 1999 | .07 | 14.52% |
| 2000 | .07 | 4.23% |
| 2001 | .07 | 5.41% |
| 2002 | .07 | -8.97% |
| 2003 | .07 | 7.04% |
| 2004 | .07 | 0.00% |
| 2005 | .07 | 3.95% |
| 2006 | .08 | 2.53% |
| 2007 | .08 | 1.23% |
| 2008 | .08 | 1.22% |
| 2009 | .08 | 6.63% |
| 2010 | .09 | 6.78% |
| 2011 | .09 | 3.17% |
| 2012 | .09 | -1.54% |
| 2013 | .09 | 0.00% |
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