30% (1974)

60% (1991)

50% (1976)

80% (1996)

64% (1991)

10% (1980)

77% (1987)

54% (1995)

58% (1982)

0% (1989)

49% (1980)

35% (1977)

30% (1983)

52% (1982)

40% (1988)

0% (1988)

65% (1994)

0% (1976)

56% (1985)

20% (1980)