72% (1984)

58% (1990)

49% (1971)

45% (1994)

59% (1984)

73% (1972)

55% (1972)

75% (1973)

62% (1972)

68% (1971)

53% (1996)

68% (1973)

64% (1971)

63% (1972)

35% (1973)

42% (1998)

43% (1992)

70% (1972)

60% (1986)

43% (1969)