41% (1997)

61% (1974)

40% (1980)

69% (1976)

53% (1982)

55% (1973)

56% (1977)

55% (1977)

20% (1989)

63% (1974)

42% (1973)

45% (1970)

30% (1990)

52% (1970)

67% (1970)

50% (1972)

10% (1973)

62% (1976)

35% (1985)

0% (1977)