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| year | consumption | change |
| 1980 | .49 | NA |
| 1981 | .48 | -1.63% |
| 1982 | .49 | 2.28% |
| 1983 | .52 | 4.46% |
| 1984 | .56 | 7.96% |
| 1985 | .57 | 2.52% |
| 1986 | .61 | 7.72% |
| 1987 | .63 | 2.44% |
| 1988 | .67 | 6.52% |
| 1989 | .67 | 0.30% |
| 1990 | .71 | 6.10% |
| 1991 | .71 | -0.14% |
| 1992 | .69 | -2.95% |
| 1993 | .74 | 7.24% |
| 1994 | .78 | 4.86% |
| 1995 | .78 | 0.90% |
| 1996 | .77 | -1.91% |
| 1997 | .79 | 2.34% |
| 1998 | .77 | -1.78% |
| 1999 | .82 | 5.56% |
| 2000 | .83 | 1.35% |
| 2001 | .85 | 2.66% |
| 2002 | .84 | -0.94% |
| 2003 | .84 | -0.48% |
| 2004 | .88 | 4.54% |
| 2005 | .85 | -3.31% |
| 2006 | .83 | -1.89% |
| 2007 | .85 | 2.41% |
| 2008 | .85 | 0.00% |
| 2009 | .84 | -1.53% |
| 2010 | .87 | 3.35% |
| 2011 | .86 | -1.16% |
| 2012 | .83 | -3.04% |
| 2013 | .86 | 3.74% |
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