60% (1999)

77% (1986)

62% (1976)

69% (1997)

55% (1987)

42% (1984)

61% (1999)

63% (1975)

71% (1981)

52% (1999)

56% (1997)

57% (1980)

62% (1997)

62% (1981)

44% (1974)

67% (1972)

48% (1977)

47% (1984)

65% (1979)

67% (1977)