68% (1989)

49% (1994)

69% (1985)

65% (1984)

59% (1989)

54% (1991)

66% (1981)

61% (1987)

49% (1992)

62% (1986)

62% (1989)

57% (1986)

61% (1988)

48% (1995)

66% (1984)

56% (1989)

49% (1987)

61% (1980)

59% (1978)

49% (1993)