80% (1981)

58% (1979)

60% (1980)

61% (1979)

60% (1988)

50% (1971)

66% (1970)

62% (1976)

68% (1970)

70% (1963)

40% (1991)

68% (1980)

65% (1984)

58% (1977)

59% (1969)

0% (1968)

0% (1961)

20% (1979)

60% (1985)

39% (1968)