71% (1991)

53% (1990)

52% (1987)

48% (1987)

65% (1986)

71% (1982)

63% (1986)

61% (1988)

56% (1984)

64% (1982)

36% (1988)

57% (1984)

55% (1991)

38% (1991)

54% (1988)

77% (2005)

48% (1987)