67% (1977)

50% (1984)

51% (1963)

53% (1968)

44% (1964)

40% (1963)

67% (1970)

41% (1976)

50% (1966)

52% (1966)

53% (1963)

64% (1974)

63% (1971)

54% (1963)

45% (1969)

40% (1973)

47% (1966)

50% (1963)

54% (1968)

50% (1975)