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| year | consumption | change |
| 1980 | .27 | NA |
| 1981 | .28 | 3.68% |
| 1982 | .32 | 12.41% |
| 1983 | .35 | 10.09% |
| 1984 | .36 | 3.44% |
| 1985 | .38 | 3.88% |
| 1986 | .40 | 6.40% |
| 1987 | .44 | 11.28% |
| 1988 | .50 | 11.71% |
| 1989 | .52 | 4.03% |
| 1990 | .47 | -8.72% |
| 1991 | .50 | 6.37% |
| 1992 | .52 | 4.59% |
| 1993 | .58 | 9.92% |
| 1994 | .56 | -2.08% |
| 1995 | .61 | 8.16% |
| 1996 | .63 | 2.62% |
| 1997 | .66 | 5.91% |
| 1998 | .71 | 6.94% |
| 1999 | .87 | 22.99% |
| 2000 | .79 | -9.98% |
| 2001 | .86 | 9.30% |
| 2002 | .93 | 7.93% |
| 2003 | .96 | 3.56% |
| 2004 | 1.07 | 11.26% |
| 2005 | 1.11 | 4.22% |
| 2006 | 1.10 | -1.08% |
| 2007 | 1.18 | 7.55% |
| 2008 | 1.11 | -6.00% |
| 2009 | 1.28 | 14.93% |
| 2010 | 1.37 | 6.81% |
| 2011 | 1.27 | -6.96% |
| 2012 | 1.20 | -5.43% |
| 2013 | 1.22 | 1.67% |
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