41% (1997)

62% (1975)

55% (1973)

63% (1974)

56% (1977)

53% (1982)

56% (1977)

40% (1980)

52% (1970)

69% (1976)

42% (1973)

45% (1970)

58% (1969)

67% (1970)

0% (1976)

20% (1989)

35% (1985)

50% (1972)

45% (1978)

45% (1963)