63% (1978)

57% (1983)

63% (1961)

68% (1979)

58% (1975)

60% (1981)

67% (1988)

58% (1976)

73% (1982)

70% (1980)

63% (1988)

57% (1985)

60% (1972)

60% (1975)

63% (1985)

80% (1985)

100% (1987)

63% (1980)

80% (1982)

45% (1984)