63% (1967)

64% (1971)

48% (1965)

45% (1980)

48% (1968)

0% (1971)

45% (1968)

35% (1981)

40% (1968)

50% (1972)

45% (1970)

54% (1968)

70% (1972)

64% (1968)

58% (1971)

67% (1952)

45% (1969)

39% (1973)

70% (1969)

60% (1967)