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| year | consumption | change |
| 1980 | .07 | NA |
| 1981 | .08 | 2.74% |
| 1982 | .08 | 9.33% |
| 1983 | .09 | 14.63% |
| 1984 | .10 | 8.51% |
| 1985 | .11 | 3.92% |
| 1986 | .09 | -13.21% |
| 1987 | .09 | -3.26% |
| 1988 | .09 | -4.49% |
| 1989 | .09 | 4.71% |
| 1990 | .09 | -3.37% |
| 1991 | .09 | -1.16% |
| 1992 | .09 | 3.53% |
| 1993 | .09 | 6.82% |
| 1994 | .11 | 17.02% |
| 1995 | .12 | 6.36% |
| 1996 | .12 | 0.85% |
| 1997 | .13 | 7.63% |
| 1998 | .14 | 8.66% |
| 1999 | .14 | 2.90% |
| 2000 | .17 | 17.61% |
| 2001 | .17 | -0.60% |
| 2002 | .19 | 13.25% |
| 2003 | .21 | 12.77% |
| 2004 | .22 | 2.36% |
| 2005 | .29 | 31.80% |
| 2006 | .27 | -6.99% |
| 2007 | .29 | 8.65% |
| 2008 | .26 | -10.03% |
| 2009 | .24 | -7.31% |
| 2010 | .24 | 0.00% |
| 2011 | .27 | 9.96% |
| 2012 | .27 | 3.40% |
| 2013 | .33 | 19.71% |
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