41% (1997)

61% (1975)

53% (1982)

20% (1989)

39% (1980)

70% (1976)

54% (1977)

64% (1976)

61% (1974)

54% (1973)

52% (1970)

45% (1970)

56% (1977)

37% (1973)

57% (1972)

30% (1990)

50% (1973)

58% (1969)

80% (1999)

45% (1978)