44% (1973)

41% (1978)

32% (1981)

45% (1980)

31% (1975)

53% (1979)

55% (1977)

52% (1976)

37% (1977)

52% (1977)

64% (2009)

42% (1986)

30% (1974)

31% (1982)

38% (1980)

38% (1983)

20% (1981)

46% (1975)

32% (1976)

44% (1989)