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| year | consumption | change |
| 1980 | .21 | NA |
| 1981 | .20 | -5.61% |
| 1982 | .24 | 17.33% |
| 1983 | .22 | -5.91% |
| 1984 | .27 | 20.18% |
| 1985 | .24 | -9.33% |
| 1986 | .26 | 5.35% |
| 1987 | .26 | 2.34% |
| 1988 | .27 | 2.29% |
| 1989 | .28 | 3.73% |
| 1990 | .34 | 23.38% |
| 1991 | .40 | 15.74% |
| 1992 | .48 | 19.65% |
| 1993 | .56 | 17.26% |
| 1994 | .56 | 0.36% |
| 1995 | .56 | 0.72% |
| 1996 | .58 | 2.84% |
| 1997 | .61 | 5.35% |
| 1998 | .62 | 2.13% |
| 1999 | .59 | -4.65% |
| 2000 | .65 | 8.59% |
| 2001 | .50 | -22.17% |
| 2002 | .53 | 4.98% |
| 2003 | .58 | 10.82% |
| 2004 | .71 | 20.72% |
| 2005 | .89 | 25.67% |
| 2006 | .97 | 9.03% |
| 2007 | 1.02 | 5.28% |
| 2008 | 1.08 | 6.49% |
| 2009 | 1.15 | 6.00% |
| 2010 | 1.27 | 10.71% |
| 2011 | 1.46 | 15.03% |
| 2012 | 1.66 | 13.27% |
| 2013 | 1.64 | -0.91% |
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