48% (1973)

52% (1990)

50% (1987)

50% (1972)

65% (1978)

44% (1988)

58% (1983)

63% (1982)

46% (2002)

50% (1980)

54% (1970)

53% (1964)

44% (1989)

50% (1988)

54% (1961)

51% (2001)

51% (1955)

43% (1989)

50% (1980)

58% (1977)