50% (1978)

90% (1987)

50% (1956)

63% (1961)

70% (1983)

67% (1991)

50% (1975)

0% (1990)

49% (1958)

50% (1986)

64% (1981)

50% (1969)

65% (1962)

50% (1977)

64% (1988)

66% (1966)

51% (1955)

53% (1989)

57% (1980)

47% (1990)