52% (1981)

50% (1981)

56% (1973)

67% (1982)

48% (1974)

51% (1978)

52% (1980)

47% (1980)

48% (1976)

44% (1970)

50% (1981)

54% (1977)

55% (1977)

42% (1974)

34% (1974)

10% (1972)

35% (1978)

66% (1973)

57% (1980)

45% (1977)