62% (1997)

72% (1979)

70% (1981)

53% (1997)

59% (1981)

72% (1984)

47% (1980)

54% (1990)

66% (1997)

58% (1984)

56% (1981)

68% (1979)

60% (1989)

59% (1991)

59% (1990)

50% (1987)

34% (1994)

49% (1997)

55% (1985)

54% (1986)