47% (1977)

55% (1984)

64% (1977)

64% (1975)

61% (1975)

44% (1984)

50% (1989)

44% (1986)

61% (1975)

47% (1992)

45% (1989)

0% (1975)

62% (1998)

61% (1975)

38% (1990)

72% (2001)

40% (1970)

32% (1998)

0% (1971)

40% (1969)