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| year | consumption | change |
| 1980 | .08 | NA |
| 1981 | .09 | 3.66% |
| 1982 | .09 | 9.41% |
| 1983 | .07 | -21.51% |
| 1984 | .06 | -12.33% |
| 1985 | .08 | 20.31% |
| 1986 | .05 | -33.77% |
| 1987 | .08 | 60.78% |
| 1988 | .07 | -13.41% |
| 1989 | .08 | 16.90% |
| 1990 | .08 | -9.64% |
| 1991 | .04 | -48.00% |
| 1992 | .06 | 41.03% |
| 1993 | .05 | -5.45% |
| 1994 | .05 | -3.85% |
| 1995 | .06 | 24.00% |
| 1996 | .06 | -6.45% |
| 1997 | .06 | 6.90% |
| 1998 | .06 | -9.68% |
| 1999 | .06 | 12.50% |
| 2000 | .07 | 3.17% |
| 2001 | .07 | 12.31% |
| 2002 | .09 | 16.44% |
| 2003 | .09 | 5.88% |
| 2004 | .10 | 11.11% |
| 2005 | .12 | 19.00% |
| 2006 | .18 | 51.26% |
| 2007 | .19 | 3.89% |
| 2008 | .19 | 3.74% |
| 2009 | .13 | -34.02% |
| 2010 | .15 | 14.84% |
| 2011 | .15 | 3.40% |
| 2012 | .15 | -4.61% |
| 2013 | .15 | 1.38% |
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