60% (1999)

69% (1997)

42% (1984)

77% (1986)

62% (1976)

63% (1975)

56% (1997)

55% (1987)

61% (1999)

52% (1999)

47% (1984)

67% (1977)

57% (1985)

62% (1981)

48% (1977)

62% (1976)

53% (1983)

59% (1980)

67% (1972)

65% (1979)