75% (1987)

64% (1976)

64% (1995)

70% (1969)

70% (1973)

70% (1970)

68% (1982)

67% (1981)

58% (1971)

55% (1996)

73% (1980)

66% (1970)

63% (1971)

0% (1979)

70% (1977)

66% (1979)

62% (1970)

53% (1982)

64% (1976)

59% (1971)