41% (1997)

52% (1970)

56% (1977)

61% (1975)

39% (1980)

53% (1982)

54% (1973)

45% (1970)

31% (1990)

70% (1976)

20% (1989)

54% (1977)

57% (1972)

61% (1974)

64% (1976)

0% (1976)

58% (1969)

45% (1972)

50% (1973)

67% (1970)