62% (1984)

51% (1967)

65% (1970)

72% (1981)

62% (1981)

65% (1973)

52% (1960)

52% (1968)

46% (1950)

80% (1964)

69% (1980)

47% (1961)

40% (1976)

61% (1976)

57% (1990)

73% (1964)

57% (1940)

80% (1981)

58% (1988)

40% (1981)