56% (1985)

34% (1984)

59% (1984)

55% (1986)

53% (1973)

44% (1983)

42% (1987)

62% (1971)

53% (1967)

56% (1970)

32% (1970)

55% (1969)

34% (1988)

61% (1975)

51% (1971)

66% (1969)

60% (1968)

42% (1974)

18% (1971)

42% (1985)