60% (1999)

77% (1986)

62% (1976)

64% (1975)

68% (1997)

42% (1984)

61% (1999)

48% (1977)

62% (1981)

56% (1997)

71% (1981)

46% (1974)

52% (1999)

53% (1983)

47% (1984)

66% (1977)

67% (1975)

67% (1972)

63% (1997)

57% (1980)