71% (1989)

42% (1972)

41% (1978)

42% (1975)

58% (1976)

39% (1977)

45% (1983)

51% (1978)

50% (1973)

48% (1980)

50% (1973)

54% (1972)

63% (1969)

46% (1983)

62% (1970)

36% (1990)

42% (1980)

50% (1973)

62% (1970)

50% (1975)