69% (1989)

70% (1985)

49% (1992)

54% (1991)

66% (1981)

59% (1989)

63% (1986)

49% (1994)

56% (1986)

65% (1984)

48% (1995)

60% (1987)

49% (1987)

61% (1988)

52% (1987)

66% (1984)

59% (1978)

54% (1992)

63% (1989)

56% (1989)