74% (1981)

30% (1988)

56% (1966)

40% (1983)

50% (1982)

80% (1986)

50% (1960)

60% (1963)

50% (1982)

42% (1982)

65% (1969)

50% (1955)

50% (1964)

50% (1990)

46% (1971)

50% (1962)

55% (1970)

53% (1961)

47% (1965)

50% (1980)