71% (1971)

63% (1997)

56% (1993)

54% (1998)

68% (1998)

60% (1998)

59% (1993)

68% (1997)

61% (2010)

58% (1997)

59% (1998)

62% (1993)

59% (1994)

46% (1991)

55% (1998)

50% (1994)

56% (1993)

0% (1989)

66% (1926)

80% (1976)