41% (1997)

61% (1974)

40% (1980)

55% (1977)

55% (1973)

10% (1973)

55% (1977)

30% (1990)

53% (1982)

67% (1970)

69% (1976)

50% (1972)

63% (1974)

53% (1969)

45% (1970)

42% (1973)

52% (1970)

62% (1976)

45% (1963)

0% (1976)