75% (1987)

67% (1978)

64% (1976)

70% (1973)

55% (1996)

70% (1970)

62% (1970)

66% (1979)

70% (1969)

67% (1981)

58% (1971)

64% (1976)

74% (1975)

53% (1982)

63% (1971)

64% (1995)

66% (1970)

0% (1979)

73% (1980)

59% (1971)