60% (1998)

66% (2006)

70% (1974)

66% (1996)

67% (2002)

49% (1991)

61% (1977)

73% (1966)

62% (1981)

69% (2003)

74% (1944)

70% (2002)

60% (1993)

67% (1966)

75% (1971)

67% (1983)

71% (1980)

64% (1977)

64% (1992)

64% (1987)