56% (1964)

64% (1958)

73% (1977)

40% (1985)

75% (1988)

58% (1974)

80% (1961)

57% (1984)

36% (1989)

0% (1936)

47% (1981)

47% (1982)

61% (1969)

20% (1988)

60% (1970)

0% (1986)

51% (1989)

61% (1975)

40% (1980)

55% (1971)