64% (1977)

60% (1975)

49% (1984)

64% (1975)

47% (1977)

49% (1992)

51% (1989)

40% (1970)

43% (1986)

36% (1990)

61% (1998)

61% (1975)

45% (1984)

32% (1998)

46% (1989)

61% (1975)

0% (1971)

10% (1971)

23% (1973)

10% (1970)