59% (1983)

54% (1980)

40% (2013)

41% (1984)

42% (1982)

59% (1987)

58% (1967)

48% (1980)

45% (2009)

66% (1973)

51% (1988)

53% (1969)

51% (1982)

49% (1976)

60% (1972)

62% (1991)

58% (1982)

58% (1969)

64% (1979)

54% (2000)