58% (1987)

52% (1986)

46% (1987)

61% (1983)

54% (1975)

52% (1987)

55% (1982)

37% (1984)

44% (1983)

42% (1985)

42% (1981)

20% (1988)

50% (1987)

30% (1985)

55% (1967)

22% (1985)

52% (1985)

50% (1988)

40% (1987)