64% (2008)

69% (1992)

70% (1989)

58% (1987)

64% (1978)

67% (1967)

65% (1973)

60% (1986)

64% (1989)

46% (1990)

50% (2004)

71% (1983)

68% (1987)

30% (1969)

55% (1990)

58% (1986)

75% (1974)

27% (1990)

48% (1968)

85% (1980)