77% (1997)

80% (1997)

80% (1987)

77% (1992)

80% (1990)

73% (1989)

71% (1984)

55% (1970)

76% (1991)

57% (1976)

40% (1983)

73% (1974)

61% (1972)

62% (1973)

65% (1970)

72% (1976)

65% (1979)

67% (1996)

65% (1974)

56% (1975)