54% (1985)

68% (1975)

70% (1979)

40% (1987)

57% (1975)

60% (1988)

63% (1987)

45% (1973)

67% (1984)

75% (1984)

70% (1981)

73% (1978)

80% (1987)

63% (1977)

70% (1978)

63% (1984)

70% (1981)

65% (1982)

70% (1986)

63% (1984)