67% (2017)

53% (1986)

74% (1964)

60% (1991)

64% (1977)

60% (1976)

50% (1974)

50% (1973)

51% (1988)

63% (1988)

54% (1979)

73% (1987)

83% (2003)

50% (1973)

60% (1977)

70% (1996)

82% (2003)

70% (2015)

55% (1978)

40% (1967)