55% (1957)

40% (1982)

54% (1989)

60% (1985)

61% (1966)

20% (1983)

48% (1963)

66% (1984)

60% (1982)

52% (1970)

20% (1978)

35% (1974)

56% (1990)

66% (1965)

64% (1966)

55% (1983)

40% (1968)

68% (1969)

50% (1982)

40% (1959)