72% (1981)

68% (1994)

69% (1981)

55% (1991)

72% (1988)

54% (1975)

46% (1979)

53% (1984)

54% (1980)

68% (1977)

49% (1979)

67% (1979)

62% (1980)

45% (1990)

54% (1988)

57% (1972)

50% (1987)

48% (1975)

0% (1983)

66% (1975)