49% (1983)

23% (1986)

49% (1983)

52% (1980)

63% (1983)

44% (1980)

60% (1987)

50% (1984)

47% (1988)

56% (1986)

52% (1976)

40% (1986)

60% (1988)

70% (1970)

61% (1984)

54% (1989)

59% (1986)

64% (1983)

0% (1984)

36% (1980)