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| year | consumption | change |
| 1980 | .16 | NA |
| 1981 | .15 | -0.65% |
| 1982 | .15 | 0.00% |
| 1983 | .16 | 3.25% |
| 1984 | .16 | 0.63% |
| 1985 | .16 | 0.00% |
| 1986 | .16 | -1.25% |
| 1987 | .16 | -1.27% |
| 1988 | .16 | 2.56% |
| 1989 | .15 | -4.37% |
| 1990 | .11 | -29.41% |
| 1991 | .09 | -13.89% |
| 1992 | .08 | -10.75% |
| 1993 | .07 | -12.05% |
| 1994 | .07 | -5.48% |
| 1995 | .08 | 10.14% |
| 1996 | .09 | 11.84% |
| 1997 | .08 | -9.41% |
| 1998 | .08 | 9.09% |
| 1999 | .10 | 13.10% |
| 2000 | .10 | 1.05% |
| 2001 | .09 | -4.17% |
| 2002 | .10 | 3.26% |
| 2003 | .11 | 20.00% |
| 2004 | .12 | 1.75% |
| 2005 | .12 | 4.31% |
| 2006 | .12 | -2.48% |
| 2007 | .10 | -12.71% |
| 2008 | .10 | 0.00% |
| 2009 | .11 | 8.74% |
| 2010 | .13 | 12.50% |
| 2011 | .11 | -13.49% |
| 2012 | .11 | -1.83% |
| 2013 | .13 | 21.50% |
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