53% (1989)

52% (1990)

30% (1987)

63% (1980)

20% (1984)

60% (1980)

49% (1988)

58% (1988)

30% (1991)

48% (1987)

56% (1987)

65% (2005)

40% (1990)

60% (1983)

48% (1984)

42% (1991)

60% (1998)