80% (1980)

64% (1984)

61% (1974)

71% (1977)

56% (1969)

52% (1970)

61% (1980)

20% (1989)

38% (1973)

64% (1969)

70% (1966)

60% (1981)

50% (1990)

55% (1983)

63% (1977)

68% (1978)

40% (1979)

70% (1972)

0% (1974)

50% (1975)