80% (1984)

60% (1989)

90% (1987)

80% (1991)

80% (1972)

52% (1984)

80% (1982)

40% (1990)

80% (1979)

80% (1978)

80% (1972)

80% (1973)

60% (1966)

0% (1975)

75% (1989)

63% (1977)

70% (1969)

0% (1985)

80% (1988)

10% (1991)