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| year | consumption | change |
| 1980 | .42 | NA |
| 1981 | .52 | 22.80% |
| 1982 | .52 | -0.19% |
| 1983 | .52 | 0.39% |
| 1984 | .56 | 7.34% |
| 1985 | .60 | 7.55% |
| 1986 | .59 | -2.01% |
| 1987 | .62 | 5.63% |
| 1988 | .66 | 6.95% |
| 1989 | .72 | 8.31% |
| 1990 | .70 | -2.65% |
| 1991 | .77 | 10.17% |
| 1992 | .79 | 2.08% |
| 1993 | .80 | 1.27% |
| 1994 | .74 | -6.54% |
| 1995 | .83 | 11.98% |
| 1996 | .85 | 2.04% |
| 1997 | .85 | 0.24% |
| 1998 | .82 | -4.11% |
| 1999 | .82 | 0.12% |
| 2000 | .81 | -0.98% |
| 2001 | .91 | 12.61% |
| 2002 | .94 | 2.63% |
| 2003 | .98 | 4.60% |
| 2004 | .98 | 0.61% |
| 2005 | 1.08 | 9.96% |
| 2006 | 1.03 | -4.90% |
| 2007 | .91 | -11.56% |
| 2008 | 1.03 | 12.86% |
| 2009 | .90 | -11.98% |
| 2010 | .81 | -10.62% |
| 2011 | .83 | 2.35% |
| 2012 | 1.14 | 37.73% |
| 2013 | 1.24 | 8.52% |
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