65% (1981)

59% (1979)

69% (1974)

61% (1981)

58% (1980)

62% (1978)

51% (1990)

58% (1976)

61% (1977)

56% (1982)

52% (1982)

41% (1964)

57% (1983)

24% (1982)

53% (1981)

66% (1981)

34% (1992)

59% (1974)

40% (1984)

0% (1916)