73% (1986)

74% (1990)

72% (1979)

71% (1982)

63% (1985)

66% (1984)

71% (1969)

70% (1986)

69% (1981)

0% (1975)

63% (1979)

70% (1969)

85% (1982)

68% (1971)

0% (1975)

75% (1986)

67% (1986)

69% (1977)

63% (1970)

0% (1966)