81% (1981)

73% (1980)

82% (1973)

59% (1982)

70% (1976)

82% (1978)

84% (1980)

77% (1974)

70% (1980)

73% (1987)

75% (1974)

51% (1977)

62% (1985)

80% (1985)

58% (1976)

60% (1972)

100% (1987)

67% (1988)

63% (1977)

57% (1985)