75% (1991)

69% (1984)

71% (1997)

60% (1972)

74% (1974)

48% (1974)

62% (1968)

70% (1982)

43% (1987)

44% (1985)

67% (1995)

68% (1989)

62% (1992)

67% (1958)

45% (1996)

50% (1972)

56% (1999)

64% (1997)

65% (1997)

43% (1992)