64% (1975)

64% (1977)

47% (1977)

55% (1984)

60% (1975)

50% (1989)

61% (1975)

38% (1990)

44% (1984)

45% (1989)

44% (1986)

32% (1998)

48% (1992)

61% (1975)

40% (1970)

60% (1998)

53% (1991)

0% (1971)

72% (2001)

0% (1975)