61% (1991)

75% (1986)

70% (1987)

71% (1987)

51% (1989)

70% (1990)

58% (1989)

65% (1988)

60% (1988)

58% (1988)

64% (1988)

51% (1990)

62% (1987)

71% (1988)

62% (1988)

90% (1983)

40% (1987)

65% (1990)

58% (1987)

73% (1989)