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| year | consumption | change |
| 1980 | .05 | NA |
| 1981 | .05 | 5.36% |
| 1982 | .06 | 5.08% |
| 1983 | .06 | 9.68% |
| 1984 | .07 | 4.41% |
| 1985 | .07 | 1.41% |
| 1986 | .08 | 12.50% |
| 1987 | .08 | 4.94% |
| 1988 | .08 | 1.18% |
| 1989 | .08 | 2.33% |
| 1990 | .08 | 1.14% |
| 1991 | .08 | 0.00% |
| 1992 | .08 | 0.00% |
| 1993 | .08 | 0.00% |
| 1994 | .08 | 2.25% |
| 1995 | .09 | 1.10% |
| 1996 | .09 | 0.00% |
| 1997 | .09 | 1.09% |
| 1998 | .09 | 2.15% |
| 1999 | .09 | 0.00% |
| 2000 | .10 | 13.19% |
| 2001 | .10 | 0.00% |
| 2002 | .20 | 100.00% |
| 2003 | .20 | 0.00% |
| 2004 | .20 | 0.00% |
| 2005 | .20 | 0.00% |
| 2006 | .20 | 0.00% |
| 2007 | .20 | 0.00% |
| 2008 | .30 | 50.00% |
| 2009 | .30 | 0.00% |
| 2010 | .30 | 0.00% |
| 2011 | .30 | 0.00% |
| 2012 | .30 | 0.00% |
| 2013 | .30 | 0.00% |
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