55% (1989)

59% (1990)

53% (1984)

70% (1976)

68% (1977)

52% (1986)

69% (1983)

69% (1990)

67% (1990)

61% (1972)

48% (1974)

58% (1991)

59% (1986)

62% (1983)

62% (1974)

65% (1978)

40% (2010)

63% (1971)

62% (1984)

60% (1989)