60% (1999)

77% (1986)

44% (1984)

68% (1997)

61% (1999)

62% (1976)

52% (1999)

63% (1975)

55% (1987)

56% (1997)

67% (1972)

47% (1984)

71% (1981)

67% (1977)

65% (1979)

63% (1997)

59% (1980)

44% (1974)

67% (1975)

62% (1981)