60% (1999)

42% (1984)

63% (1975)

68% (1997)

77% (1986)

56% (1997)

62% (1976)

67% (1977)

52% (1999)

53% (1983)

55% (1987)

47% (1984)

71% (1981)

67% (1975)

44% (1974)

62% (1981)

62% (1997)

61% (1999)

57% (1980)

67% (1972)