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| year | consumption | change |
| 1980 | .07 | NA |
| 1981 | .07 | 0.00% |
| 1982 | .07 | 1.39% |
| 1983 | .07 | 0.00% |
| 1984 | .07 | 0.00% |
| 1985 | .07 | -2.74% |
| 1986 | .07 | 4.23% |
| 1987 | .07 | 2.70% |
| 1988 | .07 | 1.32% |
| 1989 | .07 | 1.30% |
| 1990 | .07 | 2.56% |
| 1991 | .07 | 0.00% |
| 1992 | .07 | 0.00% |
| 1993 | .07 | 0.00% |
| 1994 | .07 | 0.00% |
| 1995 | .08 | 2.50% |
| 1996 | .08 | 0.00% |
| 1997 | .08 | 0.00% |
| 1998 | .08 | 0.00% |
| 1999 | .07 | -2.44% |
| 2000 | .07 | 0.00% |
| 2001 | .07 | 0.00% |
| 2002 | .08 | 6.25% |
| 2003 | .08 | 0.00% |
| 2004 | .08 | 0.00% |
| 2005 | .08 | 0.00% |
| 2006 | .08 | 5.88% |
| 2007 | .08 | 0.00% |
| 2008 | .08 | 0.00% |
| 2009 | .08 | 0.00% |
| 2010 | .08 | 0.00% |
| 2011 | .08 | 0.00% |
| 2012 | .08 | 0.00% |
| 2013 | .08 | 0.00% |
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