63% (1991)

67% (1983)

63% (1999)

70% (1993)

62% (1968)

40% (2002)

67% (1982)

52% (1983)

74% (1966)

75% (1950)

69% (1993)

67% (2007)

61% (1973)

66% (1983)

69% (2002)

69% (1933)

61% (2001)

69% (1955)

62% (2005)

66% (1934)