60% (1999)

62% (1976)

68% (1997)

77% (1986)

63% (1975)

61% (1999)

47% (1984)

66% (1977)

48% (1977)

62% (1997)

56% (1997)

52% (1999)

71% (1981)

53% (1983)

67% (1972)

67% (1975)

57% (1980)

42% (1984)

62% (1981)

56% (1998)