41% (1997)

61% (1975)

70% (1976)

56% (1977)

52% (1970)

45% (1970)

55% (1973)

40% (1980)

67% (1970)

45% (1963)

54% (1982)

30% (1990)

20% (1989)

62% (1974)

56% (1972)

56% (1977)

62% (1976)

58% (1969)

0% (1976)

45% (1972)