71% (1991)

63% (1986)

52% (1987)

65% (1986)

64% (1982)

48% (1987)

62% (1988)

56% (1984)

70% (1982)

56% (1991)

48% (1987)

54% (1990)

37% (1988)

56% (1984)

38% (1991)

54% (1988)

75% (2005)