41% (1997)

55% (1973)

20% (1989)

61% (1975)

40% (1980)

54% (1977)

61% (1974)

53% (1982)

56% (1977)

30% (1990)

62% (1976)

52% (1970)

45% (1970)

37% (1973)

58% (1969)

70% (1976)

67% (1970)

35% (1985)

0% (1972)

0% (1990)