52% (1988)

68% (1990)

62% (1992)

60% (1987)

59% (1988)

71% (1986)

52% (1987)

62% (1988)

58% (1990)

33% (1988)

63% (1994)

55% (1987)

60% (1989)

55% (1993)

61% (1988)

64% (1991)

63% (1986)

48% (1987)

63% (1986)

59% (1989)