58% (1976)

51% (1978)

42% (1972)

71% (1989)

40% (1978)

39% (1977)

45% (1983)

48% (1980)

50% (1973)

50% (1962)

63% (1969)

50% (1973)

42% (1975)

62% (1970)

62% (1970)

55% (1972)

46% (1983)

40% (1990)

52% (1980)

54% (1972)