75% (2001)

73% (1977)

62% (1973)

69% (1975)

64% (1972)

67% (1985)

70% (1974)

73% (1983)

64% (1987)

67% (1974)

57% (1974)

64% (1970)

67% (1973)

62% (1977)

60% (1994)

48% (1984)

56% (1974)

40% (1975)

70% (1973)

60% (1986)