58% (1988)

69% (1993)

71% (1981)

71% (1982)

50% (1983)

64% (1980)

70% (1939)

71% (1974)

64% (1994)

58% (1997)

59% (1993)

76% (1953)

66% (1982)

61% (1981)

75% (1963)

48% (1980)

63% (1989)

52% (1988)

58% (1996)

60% (2008)