60% (1991)

47% (1986)

35% (1963)

53% (1981)

20% (1977)

51% (1972)

0% (1978)

40% (1976)

47% (1992)

52% (1972)

59% (1964)

57% (1937)

60% (1951)

52% (1974)

70% (1988)

58% (1951)

57% (1975)

50% (1955)

0% (1961)

40% (1960)