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| year | consumption | change |
| 1980 | .01 | NA |
| 1981 | .01 | 0.00% |
| 1982 | .01 | 0.00% |
| 1983 | .01 | 0.00% |
| 1984 | .01 | 44.44% |
| 1985 | .01 | 0.00% |
| 1986 | .01 | -46.15% |
| 1987 | .01 | 42.86% |
| 1988 | .01 | 30.00% |
| 1989 | .02 | 15.38% |
| 1990 | .01 | -6.67% |
| 1991 | .01 | 0.00% |
| 1992 | .05 | 228.57% |
| 1993 | .05 | 2.17% |
| 1994 | .05 | 0.00% |
| 1995 | .05 | 2.13% |
| 1996 | .05 | 0.00% |
| 1997 | .05 | 2.08% |
| 1998 | .05 | 0.00% |
| 1999 | .05 | 0.00% |
| 2000 | .05 | 2.04% |
| 2001 | .05 | 0.00% |
| 2002 | .05 | -6.00% |
| 2003 | .05 | 4.26% |
| 2004 | .04 | -14.29% |
| 2005 | .05 | 16.67% |
| 2006 | .04 | -14.29% |
| 2007 | .04 | -7.14% |
| 2008 | .03 | -28.21% |
| 2009 | .03 | 0.00% |
| 2010 | .03 | 0.00% |
| 2011 | .03 | 0.00% |
| 2012 | .03 | 0.00% |
| 2013 | .04 | 35.71% |
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