72% (1989)

40% (1978)

42% (1972)

58% (1976)

51% (1978)

50% (1975)

39% (1977)

42% (1975)

63% (1969)

48% (1980)

55% (1972)

54% (1972)

46% (1983)

62% (1970)

53% (1971)

50% (1973)

50% (1973)

45% (1983)

40% (1990)

50% (1973)