46% (1978)

47% (1977)

35% (1991)

36% (1978)

53% (1973)

44% (1992)

53% (1986)

36% (1988)

50% (1981)

15% (1969)

35% (1970)

45% (1974)

18% (2003)

49% (1979)

37% (1986)

40% (1973)

44% (1968)

23% (1967)

55% (1984)

23% (1968)