72% (1984)

45% (1994)

58% (1990)

54% (1996)

75% (1973)

49% (1971)

55% (1972)

68% (1971)

54% (1983)

62% (1972)

73% (1972)

68% (1973)

63% (1972)

64% (1971)

56% (1972)

51% (1973)

43% (1998)

59% (1984)

70% (1972)

43% (1992)