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| year | consumption | change |
| 1980 | .02 | NA |
| 1981 | .03 | 3.85% |
| 1982 | .03 | 11.11% |
| 1983 | .03 | 0.00% |
| 1984 | .03 | 13.33% |
| 1985 | .04 | 11.76% |
| 1986 | .04 | 5.26% |
| 1987 | .04 | 7.50% |
| 1988 | .04 | 9.30% |
| 1989 | .04 | 2.13% |
| 1990 | .05 | 2.08% |
| 1991 | .05 | 4.08% |
| 1992 | .05 | 7.84% |
| 1993 | .06 | 9.09% |
| 1994 | .06 | 1.67% |
| 1995 | .06 | 13.11% |
| 1996 | .07 | 5.80% |
| 1997 | .07 | 4.11% |
| 1998 | .08 | 6.58% |
| 1999 | .08 | 0.00% |
| 2000 | .08 | 11.11% |
| 2001 | .09 | 4.44% |
| 2002 | .09 | 3.19% |
| 2003 | .10 | 6.19% |
| 2004 | .10 | 4.40% |
| 2005 | .10 | 0.00% |
| 2006 | .10 | 0.00% |
| 2007 | .10 | 0.00% |
| 2008 | .10 | 0.00% |
| 2009 | .10 | 0.00% |
| 2010 | .10 | 0.00% |
| 2011 | .10 | 0.00% |
| 2012 | .10 | 0.00% |
| 2013 | .10 | 0.00% |
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