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| year | consumption | change |
| 1980 | .11 | NA |
| 1981 | .10 | -7.62% |
| 1982 | .09 | -3.09% |
| 1983 | .10 | 4.26% |
| 1984 | .09 | -4.08% |
| 1985 | .11 | 14.89% |
| 1986 | .10 | -4.63% |
| 1987 | .11 | 3.88% |
| 1988 | .10 | -8.41% |
| 1989 | .08 | -21.43% |
| 1990 | .07 | -7.79% |
| 1991 | .12 | 66.20% |
| 1992 | .12 | 0.85% |
| 1993 | .15 | 25.21% |
| 1994 | .17 | 14.09% |
| 1995 | .18 | 7.65% |
| 1996 | .19 | 4.92% |
| 1997 | .22 | 14.58% |
| 1998 | .22 | 1.82% |
| 1999 | .23 | 2.68% |
| 2000 | .23 | 1.74% |
| 2001 | .23 | -3.85% |
| 2002 | .23 | 1.78% |
| 2003 | .24 | 3.93% |
| 2004 | .23 | -4.20% |
| 2005 | .22 | -3.95% |
| 2006 | .19 | -11.42% |
| 2007 | .18 | -7.73% |
| 2008 | .23 | 27.93% |
| 2009 | .28 | 23.58% |
| 2010 | .27 | -3.53% |
| 2011 | .27 | -0.37% |
| 2012 | .28 | 1.47% |
| 2013 | .23 | -15.94% |
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