52% (1976)

44% (1973)

41% (1978)

32% (1981)

31% (1975)

44% (1980)

66% (2009)

52% (1977)

45% (1980)

55% (1977)

42% (1986)

33% (1983)

31% (1982)

38% (1983)

44% (1964)

38% (1980)

46% (1975)

20% (1981)

37% (1977)

53% (1979)