74% (1984)

58% (1985)

54% (1989)

65% (1986)

59% (1988)

67% (1987)

65% (1981)

62% (1985)

42% (1986)

41% (1999)

57% (1988)

55% (1985)

51% (1991)

42% (1991)

54% (1995)

41% (1985)

43% (1990)

32% (1994)

59% (1984)

52% (1992)