54% (1992)

54% (1981)

53% (1988)

64% (1970)

66% (1972)

46% (1986)

64% (1980)

54% (1986)

51% (1972)

53% (1980)

60% (1971)

55% (1987)

52% (1979)

48% (1976)

62% (1972)

47% (1978)

52% (1987)

66% (1984)

32% (1989)

55% (1984)