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| year | consumption | change |
| 1980 | .03 | NA |
| 1981 | .03 | 3.33% |
| 1982 | .03 | 9.68% |
| 1983 | .04 | 14.71% |
| 1984 | .04 | 0.00% |
| 1985 | .05 | 17.95% |
| 1986 | .05 | -2.17% |
| 1987 | .05 | 11.11% |
| 1988 | .05 | -2.00% |
| 1989 | .05 | 6.12% |
| 1990 | .05 | 1.92% |
| 1991 | .05 | -13.21% |
| 1992 | .06 | 34.78% |
| 1993 | .06 | -4.84% |
| 1994 | .04 | -25.42% |
| 1995 | .05 | 9.09% |
| 1996 | .04 | -16.67% |
| 1997 | .04 | 0.00% |
| 1998 | .05 | 30.00% |
| 1999 | .06 | 17.31% |
| 2000 | .07 | 6.56% |
| 2001 | .07 | 7.69% |
| 2002 | .07 | 5.71% |
| 2003 | .08 | 9.46% |
| 2004 | .09 | 4.94% |
| 2005 | .09 | 7.06% |
| 2006 | .10 | 13.19% |
| 2007 | .11 | 8.74% |
| 2008 | .13 | 17.86% |
| 2009 | .13 | -0.76% |
| 2010 | .14 | 5.34% |
| 2011 | .17 | 19.57% |
| 2012 | .19 | 14.55% |
| 2013 | .20 | 7.41% |
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