72% (1988)

64% (1977)

59% (1980)

68% (1980)

59% (1986)

62% (1986)

48% (1979)

64% (1980)

60% (1978)

63% (1972)

33% (1975)

62% (1987)

20% (1980)

61% (1973)

60% (1986)

60% (1979)

63% (1974)

62% (1974)

48% (1986)

75% (1993)