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| year | consumption | change |
| 1980 | .14 | NA |
| 1981 | .16 | 14.49% |
| 1982 | .17 | 6.33% |
| 1983 | .18 | 5.95% |
| 1984 | .17 | -3.37% |
| 1985 | .21 | 19.19% |
| 1986 | .22 | 7.80% |
| 1987 | .27 | 19.91% |
| 1988 | .23 | -13.58% |
| 1989 | .23 | 2.18% |
| 1990 | .26 | 9.40% |
| 1991 | .29 | 12.11% |
| 1992 | .24 | -16.03% |
| 1993 | .29 | 19.09% |
| 1994 | .28 | -1.39% |
| 1995 | .28 | 0.35% |
| 1996 | .28 | 0.00% |
| 1997 | .34 | 17.96% |
| 1998 | .35 | 5.07% |
| 1999 | .36 | 1.14% |
| 2000 | .37 | 2.53% |
| 2001 | .38 | 3.29% |
| 2002 | .40 | 5.57% |
| 2003 | .41 | 2.51% |
| 2004 | .42 | 2.70% |
| 2005 | .46 | 9.07% |
| 2006 | .49 | 7.00% |
| 2007 | .51 | 4.29% |
| 2008 | .54 | 4.90% |
| 2009 | .55 | 2.06% |
| 2010 | .55 | 1.10% |
| 2011 | .55 | -0.72% |
| 2012 | .59 | 7.85% |
| 2013 | .68 | 15.06% |
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