63% (1988)

52% (2005)

61% (1985)

67% (1964)

60% (1977)

51% (1962)

62% (1986)

66% (1978)

62% (1981)

66% (1980)

50% (1994)

50% (1995)

64% (1999)

63% (1992)

49% (1963)

49% (2008)

57% (2002)

58% (1990)

52% (1973)

65% (1983)