51% (1977)

49% (1978)

36% (1988)

45% (1981)

62% (1964)

55% (1980)

45% (1973)

45% (1989)

51% (1988)

52% (1972)

45% (1976)

55% (1980)

54% (1979)

62% (1972)

50% (1990)

69% (1967)

59% (1964)

56% (1984)

50% (1988)

53% (1975)