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| year | consumption | change |
| 1980 | .13 | NA |
| 1981 | .14 | 8.59% |
| 1982 | .15 | 7.91% |
| 1983 | .14 | -6.67% |
| 1984 | .17 | 19.29% |
| 1985 | .17 | 3.59% |
| 1986 | .19 | 8.67% |
| 1987 | .21 | 10.11% |
| 1988 | .23 | 11.59% |
| 1989 | .25 | 9.09% |
| 1990 | .25 | 0.40% |
| 1991 | .26 | 1.58% |
| 1992 | .29 | 11.28% |
| 1993 | .31 | 6.99% |
| 1994 | .34 | 11.11% |
| 1995 | .38 | 12.35% |
| 1996 | .39 | 1.31% |
| 1997 | .40 | 4.13% |
| 1998 | .42 | 3.97% |
| 1999 | .47 | 10.98% |
| 2000 | .50 | 8.39% |
| 2001 | .55 | 9.72% |
| 2002 | .59 | 5.79% |
| 2003 | .64 | 8.55% |
| 2004 | .68 | 6.30% |
| 2005 | .72 | 6.37% |
| 2006 | .79 | 9.61% |
| 2007 | .82 | 3.94% |
| 2008 | .89 | 9.05% |
| 2009 | .97 | 8.63% |
| 2010 | .94 | -2.58% |
| 2011 | 1.00 | 5.51% |
| 2012 | 1.08 | 8.43% |
| 2013 | 1.13 | 4.54% |
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