50% (1977)

53% (1979)

54% (1981)

55% (1982)

52% (1979)

52% (1988)

56% (1980)

52% (1978)

53% (1980)

54% (2009)

58% (1978)

29% (1966)

55% (1980)

75% (1974)

63% (1968)

69% (1977)

53% (1980)

56% (1975)

46% (1986)

64% (1980)