43% (1976)

43% (1961)

45% (1981)

44% (1988)

37% (1986)

45% (1977)

45% (1969)

39% (1975)

28% (1985)

33% (1983)

53% (1980)

34% (1969)

46% (1967)

66% (1971)

43% (1986)

49% (1979)

55% (1973)

40% (1972)

24% (1984)

53% (1978)