Breaks in series: Belgium 2003; Canada 1975 ; France 1995, 2003; Sweden 1993; Switzerland 1995, 2008; and the United Kingdom 1997. Canada data are estimated in 2012. Data for Belgium from 1995 - 2002 reflect a difference in methodology. Data unavailable for: the Netherlands 1970, 1971, and 2003 - 2012; Australia in 1970 and 2012; Canada in 2011; Belgium from 1970 -1994; Germany 1991; Switzerland 1970 - 1985; and France from 1971 - 1974, 1976 -1 979; 1981 - 1984, and 1986 - 1989.