51% (1967)

60% (1953)

65% (1970)

60% (1977)

0% (1988)

56% (1964)

43% (1975)

60% (1954)

62% (1961)

60% (1983)

50% (1965)

36% (1985)

40% (1979)

45% (1991)

50% (1989)

70% (1953)

54% (1977)

63% (1982)

43% (1987)

20% (1983)