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| year | consumption | change |
| 1980 | .03 | NA |
| 1981 | .03 | 0.00% |
| 1982 | .03 | 0.00% |
| 1983 | .03 | 3.45% |
| 1984 | .03 | 10.00% |
| 1985 | .04 | 6.06% |
| 1986 | .04 | 2.86% |
| 1987 | .04 | 8.33% |
| 1988 | .04 | -5.13% |
| 1989 | .04 | 2.70% |
| 1990 | .04 | 0.00% |
| 1991 | .04 | 0.00% |
| 1992 | .04 | 5.26% |
| 1993 | .04 | 2.50% |
| 1994 | .04 | -4.88% |
| 1995 | .05 | 15.38% |
| 1996 | .05 | 4.44% |
| 1997 | .04 | -6.38% |
| 1998 | .05 | 2.27% |
| 1999 | .05 | 0.00% |
| 2000 | .05 | 2.22% |
| 2001 | .05 | 0.00% |
| 2002 | .06 | 32.61% |
| 2003 | .07 | 13.11% |
| 2004 | .07 | 0.00% |
| 2005 | .07 | 1.45% |
| 2006 | .07 | 2.86% |
| 2007 | .07 | 1.39% |
| 2008 | .06 | -19.18% |
| 2009 | .06 | -1.69% |
| 2010 | .06 | 1.72% |
| 2011 | .06 | -3.39% |
| 2012 | .05 | -8.77% |
| 2013 | .06 | 7.69% |
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