20% (1984)

54% (1975)

44% (1986)

50% (1987)

60% (1983)

52% (1982)

70% (1985)

47% (1989)

39% (1981)

50% (1988)

47% (1981)

60% (1995)

70% (1986)

0% (1983)

10% (1981)

40% (1983)

48% (1978)

62% (1982)

10% (1975)

0% (1990)