71% (1974)

57% (1988)

67% (1983)

66% (1984)

75% (1970)

66% (1984)

70% (1972)

69% (1968)

60% (1986)

46% (1977)

60% (1980)

60% (1981)

63% (1981)

65% (1980)

58% (1970)

56% (1971)

60% (1970)

60% (1971)

0% (1977)

63% (1972)