60% (1975)

75% (1974)

76% (1969)

48% (1973)

59% (1968)

56% (1975)

58% (1996)

60% (1973)

63% (1974)

50% (1969)

50% (1977)

42% (1988)

46% (1973)

59% (1970)

62% (1977)

53% (1974)

30% (1974)

71% (1971)

48% (1983)

62% (1990)