53% (1982)

42% (1997)

61% (1975)

56% (1977)

40% (1980)

55% (1973)

56% (1977)

60% (1969)

62% (1976)

20% (1989)

63% (1974)

30% (1990)

52% (1970)

45% (1970)

42% (1973)

67% (1970)

50% (1972)

69% (1976)

45% (1963)

10% (1973)