73% (1983)

75% (1984)

73% (1975)

74% (1981)

72% (1981)

65% (1989)

66% (1986)

36% (1986)

40% (1974)

71% (1986)

69% (1986)

0% (1979)

54% (1981)

0% (1977)

62% (1976)

46% (1981)

69% (1980)

67% (1985)

62% (1968)

0% (1992)