72% (2016)

73% (1977)

75% (2001)

71% (1974)

70% (1975)

63% (1973)

65% (1972)

69% (1985)

64% (1970)

67% (1973)

60% (1974)

74% (1983)

56% (1974)

64% (1987)

53% (1984)

61% (1977)

60% (1994)

69% (1974)

47% (1980)

40% (1975)