0% (1980)

49% (1996)

56% (1965)

48% (1975)

58% (1984)

55% (1973)

45% (1976)

55% (1981)

59% (1971)

65% (1967)

53% (1985)

51% (1987)

55% (1973)

55% (1974)

59% (1983)

56% (1965)

40% (1965)

64% (1976)

61% (1965)

46% (1977)