37% (1988)

45% (1989)

48% (1978)

38% (1990)

70% (1985)

48% (1975)

56% (1980)

50% (1988)

60% (1974)

70% (1985)

56% (1993)

44% (1986)

80% (1975)

0% (1968)

46% (1987)

54% (1981)

59% (1981)

64% (1970)

72% (1988)

0% (1976)