63% (1966)

70% (1979)

57% (1981)

60% (1983)

80% (1989)

70% (1977)

67% (1969)

71% (1980)

63% (1978)

65% (1986)

50% (1976)

62% (1983)

68% (1971)

57% (1967)

66% (2001)

43% (1985)

67% (1995)

67% (1970)

56% (1976)

71% (1983)