60% (1997)

64% (1973)

59% (1976)

63% (1991)

54% (1990)

62% (1977)

66% (1974)

45% (1977)

63% (1973)

42% (1976)

52% (1991)

37% (1974)

0% (1989)

30% (1986)

0% (1985)