68% (1989)

70% (1985)

67% (1981)

54% (1991)

49% (1994)

62% (1986)

50% (1992)

65% (1984)

47% (1979)

63% (1989)

59% (1989)

56% (1986)

47% (1987)

62% (1988)

60% (1980)

49% (1993)

58% (1978)

48% (1995)

64% (1986)

56% (1989)