41% (1997)

53% (1982)

39% (1980)

55% (1973)

32% (1990)

20% (1989)

70% (1976)

45% (1970)

61% (1975)

54% (1977)

56% (1977)

64% (1976)

58% (1969)

0% (1977)

52% (1970)

67% (1970)

61% (1974)

37% (1973)

50% (1973)

10% (1973)