70% (1991)

63% (1989)

67% (1990)

70% (1993)

70% (1993)

53% (1986)

68% (1990)

66% (1988)

50% (1988)

60% (1988)

55% (1992)

62% (1989)

59% (1990)

33% (1987)

48% (1989)

60% (1991)

56% (1984)

59% (1988)

0% (1987)

73% (1991)