80% (1953)

80% (1969)

68% (1964)

66% (1968)

66% (1966)

66% (1965)

74% (1970)

60% (1970)

70% (1968)

64% (1970)

65% (1969)

54% (1967)

57% (1965)

63% (1970)

67% (1961)

61% (1966)

57% (1967)

60% (1964)

60% (1966)

34% (1966)