70% (1979)

45% (1990)

53% (1976)

73% (1970)

70% (1962)

69% (1963)

66% (1964)

68% (1969)

60% (1971)

66% (1972)

69% (1965)

53% (1985)

52% (1988)

61% (1978)

63% (1965)

70% (2006)

34% (1987)

67% (1971)

51% (1987)

59% (1983)