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| year | consumption | change |
| 1980 | .13 | NA |
| 1981 | .14 | 10.16% |
| 1982 | .13 | -4.96% |
| 1983 | .15 | 14.18% |
| 1984 | .17 | 9.15% |
| 1985 | .17 | 2.40% |
| 1986 | .18 | 5.85% |
| 1987 | .17 | -7.18% |
| 1988 | .18 | 6.55% |
| 1989 | .20 | 13.97% |
| 1990 | .20 | -0.98% |
| 1991 | .20 | -1.98% |
| 1992 | .19 | -4.04% |
| 1993 | .22 | 14.74% |
| 1994 | .24 | 8.72% |
| 1995 | .21 | -10.55% |
| 1996 | .23 | 8.96% |
| 1997 | .27 | 16.02% |
| 1998 | .29 | 7.09% |
| 1999 | .29 | 0.70% |
| 2000 | .30 | 4.15% |
| 2001 | .34 | 11.63% |
| 2002 | .34 | 0.60% |
| 2003 | .33 | -2.07% |
| 2004 | .33 | 0.91% |
| 2005 | .36 | 7.19% |
| 2006 | .33 | -6.98% |
| 2007 | .29 | -11.71% |
| 2008 | .31 | 4.42% |
| 2009 | .30 | -2.28% |
| 2010 | .31 | 3.00% |
| 2011 | .30 | -3.88% |
| 2012 | .33 | 9.43% |
| 2013 | .35 | 7.69% |
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