61% (1988)

58% (1986)

66% (1980)

61% (1987)

70% (1994)

40% (1980)

45% (1997)

31% (1986)

56% (1978)

63% (1980)

0% (1981)

95% (1979)

42% (1992)

35% (1982)

40% (1978)

45% (1986)

55% (1979)

30% (1986)

30% (1976)

53% (1987)