57% (1975)

71% (1977)

59% (1988)

0% (1968)

58% (1990)

48% (1989)

48% (1970)

46% (1991)

68% (1974)

48% (1969)

59% (1967)

0% (1992)

54% (1987)

41% (1971)

50% (1962)

51% (1965)

60% (1993)

37% (1964)

56% (1994)

57% (1992)