49% (2007)

54% (2006)

68% (1960)

67% (1976)

57% (1985)

62% (1992)

75% (1950)

75% (1982)

63% (2005)

53% (1992)

70% (1981)

65% (1982)

61% (1977)

72% (1966)

60% (2006)

56% (1987)

60% (2004)

65% (1954)

64% (1974)

47% (2001)