58% (1979)

65% (1981)

70% (1974)

51% (1990)

56% (1982)

42% (1964)

60% (1981)

66% (1981)

59% (1974)

57% (1983)

34% (1992)

61% (1977)

62% (1978)

58% (1980)

52% (1982)

40% (1984)

53% (1981)

58% (1976)

40% (1921)

50% (1968)