61% (1999)

42% (1984)

69% (1997)

62% (1976)

70% (1983)

68% (1990)

77% (1986)

63% (1975)

52% (1999)

61% (1999)

47% (1984)

67% (1972)

62% (1981)

55% (1997)

48% (1977)

62% (1976)

42% (1974)

70% (1981)

56% (1987)

53% (1983)