41% (1971)

48% (1969)

46% (1991)

71% (1977)

68% (1974)

0% (1992)

59% (1976)

56% (1994)

57% (1975)

35% (1968)

40% (1991)

59% (1988)

59% (1967)

48% (1970)

54% (1987)

61% (1972)

57% (1992)

60% (1984)

40% (1990)

0% (1968)