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| year | consumption | change |
| 1980 | .05 | NA |
| 1981 | .06 | 13.79% |
| 1982 | .07 | 18.18% |
| 1983 | .08 | 14.10% |
| 1984 | .10 | 16.85% |
| 1985 | .10 | 3.39% |
| 1986 | .10 | 0.00% |
| 1987 | .10 | 0.00% |
| 1988 | .20 | 100.00% |
| 1989 | .20 | 0.00% |
| 1990 | .20 | 0.00% |
| 1991 | .20 | 0.00% |
| 1992 | .20 | 0.00% |
| 1993 | .20 | 0.00% |
| 1994 | .20 | 0.00% |
| 1995 | .30 | 50.00% |
| 1996 | .30 | 0.00% |
| 1997 | .30 | 0.00% |
| 1998 | .30 | 0.00% |
| 1999 | .30 | 0.00% |
| 2000 | .40 | 33.33% |
| 2001 | .40 | 0.00% |
| 2002 | .40 | 0.00% |
| 2003 | .40 | 0.00% |
| 2004 | .50 | 25.00% |
| 2005 | .40 | -20.00% |
| 2006 | .50 | 25.00% |
| 2007 | .50 | 0.00% |
| 2008 | .50 | 0.00% |
| 2009 | .60 | 20.00% |
| 2010 | .60 | 0.00% |
| 2011 | .60 | 0.00% |
| 2012 | .50 | -16.67% |
| 2013 | .60 | 20.00% |
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