61% (1987)

61% (1988)

66% (1980)

58% (1986)

44% (1997)

40% (1980)

70% (1994)

31% (1986)

63% (1980)

53% (1987)

35% (1982)

0% (1979)

42% (1992)

95% (1979)

30% (1986)

56% (1978)

45% (1986)

20% (1977)

30% (1976)

0% (1987)