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| year | consumption | change |
| 1980 | .03 | NA |
| 1981 | .04 | 21.62% |
| 1982 | .04 | -2.22% |
| 1983 | .04 | 2.27% |
| 1984 | .04 | 4.44% |
| 1985 | .04 | 2.13% |
| 1986 | .05 | 10.42% |
| 1987 | .05 | 9.43% |
| 1988 | .06 | 5.17% |
| 1989 | .05 | -6.56% |
| 1990 | .06 | 15.79% |
| 1991 | .06 | 0.00% |
| 1992 | .06 | 1.52% |
| 1993 | .06 | 2.99% |
| 1994 | .06 | 0.00% |
| 1995 | .07 | 1.45% |
| 1996 | .07 | 1.43% |
| 1997 | .07 | 5.63% |
| 1998 | .08 | 9.33% |
| 1999 | .08 | 10.98% |
| 2000 | .10 | 18.16% |
| 2001 | .10 | 0.00% |
| 2002 | .10 | 0.00% |
| 2003 | .10 | 0.00% |
| 2004 | .20 | 100.00% |
| 2005 | .20 | 0.00% |
| 2006 | .20 | 0.00% |
| 2007 | .20 | 0.00% |
| 2008 | .20 | 0.00% |
| 2009 | .20 | 0.00% |
| 2010 | .20 | 0.00% |
| 2011 | .20 | 0.00% |
| 2012 | .20 | 0.00% |
| 2013 | .20 | 0.00% |
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