40% (1973)

60% (2013)

36% (1978)

39% (1987)

34% (1983)

43% (1977)

53% (1979)

36% (1975)

40% (1963)

38% (1989)

37% (1981)

30% (1974)

0% (1976)

55% (1964)

23% (1974)

66% (2009)

50% (1956)

20% (1981)

10% (1981)

42% (1981)