72% (1984)

58% (1990)

45% (1994)

53% (1996)

55% (1972)

62% (1972)

49% (1971)

75% (1973)

68% (1973)

73% (1972)

68% (1971)

63% (1972)

59% (1984)

70% (1972)

43% (1992)

43% (1998)

64% (1971)

56% (1972)

54% (1983)

51% (1973)