55% (1990)

40% (1990)

48% (1987)

42% (1991)

30% (1987)

60% (1980)

20% (1984)

58% (1988)

60% (1998)

51% (1984)

31% (1991)

56% (1987)

50% (1988)

54% (1989)

60% (1983)

62% (1980)

79% (2005)