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| year | consumption | change |
| 1980 | .03 | NA |
| 1981 | .03 | 3.03% |
| 1982 | .03 | -2.94% |
| 1983 | .03 | -3.03% |
| 1984 | .03 | 0.00% |
| 1985 | .04 | 12.50% |
| 1986 | .04 | -2.78% |
| 1987 | .04 | 2.86% |
| 1988 | .04 | 2.78% |
| 1989 | .04 | 8.11% |
| 1990 | .04 | -7.50% |
| 1991 | .04 | -5.41% |
| 1992 | .04 | 14.29% |
| 1993 | .04 | 2.50% |
| 1994 | .04 | 2.44% |
| 1995 | .05 | 7.14% |
| 1996 | .05 | 4.44% |
| 1997 | .05 | 4.26% |
| 1998 | .05 | 6.12% |
| 1999 | .06 | 9.62% |
| 2000 | .06 | -3.51% |
| 2001 | .06 | 7.27% |
| 2002 | .06 | 1.69% |
| 2003 | .06 | 1.67% |
| 2004 | .06 | 4.92% |
| 2005 | .07 | 7.81% |
| 2006 | .07 | -1.45% |
| 2007 | .07 | 2.94% |
| 2008 | .07 | 1.43% |
| 2009 | .07 | -1.41% |
| 2010 | .07 | 2.86% |
| 2011 | .08 | 8.33% |
| 2012 | .08 | 2.56% |
| 2013 | .09 | 11.25% |
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