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| year | consumption | change |
| 1980 | .01 | NA |
| 1981 | .01 | 10.00% |
| 1982 | .01 | -9.09% |
| 1983 | .01 | -10.00% |
| 1984 | .01 | 11.11% |
| 1985 | .01 | 10.00% |
| 1986 | .01 | 9.09% |
| 1987 | .01 | 8.33% |
| 1988 | .01 | 0.00% |
| 1989 | .01 | 7.69% |
| 1990 | .01 | 7.14% |
| 1991 | .01 | 0.00% |
| 1992 | .01 | 0.67% |
| 1993 | .01 | 0.00% |
| 1994 | .01 | 0.00% |
| 1995 | .02 | 26.49% |
| 1996 | .02 | 0.00% |
| 1997 | .02 | 0.00% |
| 1998 | .02 | 0.00% |
| 1999 | .02 | 10.47% |
| 2000 | .02 | 14.22% |
| 2001 | .02 | 0.00% |
| 2002 | .02 | 8.30% |
| 2003 | .03 | 3.83% |
| 2004 | .03 | 0.11% |
| 2005 | .03 | 0.00% |
| 2006 | .03 | 11.06% |
| 2007 | .03 | 3.32% |
| 2008 | .03 | 3.21% |
| 2009 | .03 | -3.11% |
| 2010 | .03 | 3.21% |
| 2011 | .03 | 0.00% |
| 2012 | .03 | -0.40% |
| 2013 | .03 | 0.00% |
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