71% (1970)

74% (1968)

45% (1987)

62% (1978)

59% (1998)

68% (1983)

58% (1978)

56% (1989)

56% (1991)

50% (1967)

74% (1999)

47% (1993)

62% (1985)

52% (1989)

62% (1987)

48% (2002)

48% (1957)

72% (1965)

55% (1993)

68% (2018)