61% (1972)

60% (1969)

42% (1981)

64% (1971)

50% (1967)

40% (1969)

54% (1972)

42% (1981)

64% (1971)

55% (1973)

55% (1964)

67% (1952)

40% (1968)

58% (1968)

60% (1971)

57% (1971)

30% (1971)

40% (1966)

57% (1978)

42% (1968)