56% (1982)

80% (1980)

60% (1980)

55% (1989)

73% (1980)

82% (1981)

56% (1975)

51% (1987)

72% (1977)

53% (1982)

54% (1978)

30% (1991)

62% (1989)

65% (1984)

62% (1989)

70% (1977)

58% (1982)

63% (1987)

68% (1981)

56% (1986)