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| year | consumption | change |
| 1980 | .07 | NA |
| 1981 | .06 | -14.93% |
| 1982 | .06 | 1.75% |
| 1983 | .06 | 8.62% |
| 1984 | .05 | -14.29% |
| 1985 | .06 | 12.96% |
| 1986 | .07 | 6.56% |
| 1987 | .07 | 0.00% |
| 1988 | .07 | 9.23% |
| 1989 | .08 | 5.63% |
| 1990 | .08 | 6.67% |
| 1991 | .08 | -2.50% |
| 1992 | .09 | 8.97% |
| 1993 | .09 | 8.24% |
| 1994 | .10 | 11.96% |
| 1995 | .11 | 5.83% |
| 1996 | .11 | 3.67% |
| 1997 | .12 | 8.85% |
| 1998 | .14 | 15.45% |
| 1999 | .15 | 7.75% |
| 2000 | .16 | 3.27% |
| 2001 | .17 | 7.59% |
| 2002 | .17 | -0.59% |
| 2003 | .18 | 8.88% |
| 2004 | .19 | 2.72% |
| 2005 | .20 | 3.70% |
| 2006 | .20 | 2.04% |
| 2007 | .21 | 4.00% |
| 2008 | .20 | -3.85% |
| 2009 | .21 | 3.00% |
| 2010 | .21 | -0.49% |
| 2011 | .21 | 1.95% |
| 2012 | .21 | 1.91% |
| 2013 | .24 | 13.15% |
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