69% (1967)

73% (1978)

84% (1989)

50% (1982)

80% (1980)

0% (1987)

68% (1984)

65% (1979)

80% (1987)

70% (1980)

48% (1981)

0% (1978)

85% (1979)

50% (1989)

65% (1968)

57% (1984)

60% (1980)

40% (1986)

65% (1980)

60% (1986)