41% (1997)

61% (1975)

40% (1980)

53% (1982)

45% (1970)

55% (1973)

20% (1989)

52% (1970)

56% (1977)

62% (1976)

30% (1990)

62% (1974)

56% (1977)

42% (1973)

69% (1976)

45% (1978)

67% (1970)

0% (1977)

45% (1963)

35% (1985)