71% (1971)

62% (2010)

58% (1997)

68% (1998)

60% (1998)

65% (1997)

54% (1998)

49% (1994)

58% (1998)

58% (1994)

56% (1993)

54% (1998)

62% (1993)

46% (1991)

56% (1993)

59% (1993)

68% (1997)

80% (1976)

65% (1926)

0% (1989)