61% (1999)

69% (1997)

42% (1984)

68% (1990)

63% (1975)

77% (1986)

62% (1976)

61% (1999)

52% (1999)

70% (1983)

56% (1987)

67% (1977)

42% (1974)

67% (1972)

47% (1984)

62% (1981)

57% (1985)

70% (1981)

48% (1977)

59% (1980)