69% (1967)

73% (1978)

80% (1989)

70% (1980)

0% (1978)

0% (1982)

65% (1968)

68% (1984)

0% (1980)

60% (1980)

70% (1983)

80% (1980)

0% (1987)

20% (1982)

60% (1981)

40% (1986)

50% (1982)

64% (1987)

0% (1963)

70% (1987)