61% (1987)

67% (1980)

58% (1986)

62% (1988)

56% (1978)

40% (1980)

45% (1997)

63% (1980)

42% (1992)

35% (1982)

31% (1986)

20% (1977)

40% (1976)

55% (1979)

0% (1981)

30% (1986)

0% (1987)

45% (1986)

0% (1979)

95% (1979)