41% (1997)

61% (1975)

52% (1970)

56% (1977)

53% (1982)

40% (1980)

55% (1973)

35% (1985)

67% (1970)

69% (1976)

64% (1974)

45% (1970)

20% (1989)

56% (1977)

42% (1973)

53% (1969)

10% (1973)

30% (1990)

50% (1972)

62% (1976)