55% (1968)

65% (1972)

67% (1989)

78% (1979)

42% (1966)

42% (1979)

76% (1987)

43% (1977)

66% (1988)

70% (1979)

37% (1977)

60% (1990)

53% (1986)

65% (1970)

60% (1990)

73% (1968)

56% (1979)

54% (1967)

52% (1983)

53% (1964)