64% (1975)

60% (1975)

64% (1977)

47% (1977)

49% (1984)

61% (1975)

43% (1986)

40% (1970)

51% (1989)

45% (1984)

61% (1998)

49% (1992)

36% (1990)

46% (1989)

35% (1996)

40% (1969)

32% (1998)

61% (1975)

73% (2001)

23% (1973)