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| year | consumption | change |
| 1980 | .05 | NA |
| 1981 | .05 | 4.00% |
| 1982 | .05 | 3.85% |
| 1983 | .06 | 1.85% |
| 1984 | .06 | 0.00% |
| 1985 | .06 | 3.64% |
| 1986 | .06 | 3.51% |
| 1987 | .06 | -1.69% |
| 1988 | .06 | 6.90% |
| 1989 | .07 | 14.52% |
| 1990 | .07 | 0.00% |
| 1991 | .07 | 0.00% |
| 1992 | .08 | 11.27% |
| 1993 | .07 | -8.62% |
| 1994 | .08 | 6.93% |
| 1995 | .08 | 0.00% |
| 1996 | .08 | 2.41% |
| 1997 | .08 | 2.35% |
| 1998 | .09 | 5.75% |
| 1999 | .09 | 4.35% |
| 2000 | .10 | 12.01% |
| 2001 | .10 | 0.00% |
| 2002 | .10 | 0.00% |
| 2003 | .10 | 0.00% |
| 2004 | .10 | 0.00% |
| 2005 | .10 | 0.00% |
| 2006 | .10 | 0.00% |
| 2007 | .10 | 0.00% |
| 2008 | .20 | 100.00% |
| 2009 | .20 | 0.00% |
| 2010 | .20 | 0.00% |
| 2011 | .20 | 0.00% |
| 2012 | .20 | 0.00% |
| 2013 | .20 | 0.00% |
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