69% (1984)

50% (1981)

58% (1970)

63% (1972)

46% (1984)

60% (1975)

63% (1976)

70% (1968)

57% (1988)

52% (1980)

68% (1978)

30% (1968)

66% (1984)

67% (1976)

75% (1977)

68% (1962)

60% (1980)

0% (1977)

60% (1986)

61% (1978)