54% (1992)

64% (1970)

54% (1981)

52% (1988)

55% (1987)

64% (1980)

53% (1980)

45% (1978)

46% (1986)

51% (1972)

54% (1986)

45% (1989)

52% (1979)

32% (1989)

66% (1972)

52% (1987)

48% (1976)

57% (1983)

58% (1981)

46% (1976)