36% (1975)

31% (1984)

47% (1964)

32% (1976)

34% (1983)

44% (1989)

53% (1979)

38% (1989)

39% (1987)

66% (2009)

28% (1979)

37% (1981)

43% (1977)

36% (1978)

23% (1974)

40% (1973)

60% (2013)

27% (1982)

30% (1973)

48% (1975)