50% (1956)

50% (1939)

59% (1976)

60% (1960)

60% (1989)

67% (1987)

50% (1951)

37% (1980)

70% (1990)

47% (1990)

22% (1967)

0% (1980)

75% (1986)

45% (1983)

20% (1990)

57% (1975)

55% (1974)

40% (1983)

49% (1971)

40% (1972)