56% (1981)

52% (1991)

71% (1989)

57% (1991)

66% (1980)

65% (1986)

70% (1981)

54% (1994)

80% (1984)

73% (1987)

61% (1989)

67% (1983)

61% (1988)

60% (1976)

65% (1983)

57% (1993)

50% (1988)

63% (1986)

61% (1984)

77% (1986)