59% (1988)

72% (1977)

59% (1976)

59% (1975)

45% (1991)

41% (1971)

51% (1969)

56% (1994)

80% (1979)

54% (1987)

60% (1993)

42% (1990)

68% (1974)

59% (1967)

51% (1965)

44% (1964)

61% (1972)

48% (1989)

48% (1970)

58% (1990)