64% (1989)

48% (1987)

60% (1986)

55% (1990)

59% (1987)

53% (1982)

50% (1981)

70% (1984)

71% (1977)

75% (1983)

52% (1980)

60% (1988)

69% (1981)

0% (1988)

20% (1980)

47% (1978)

56% (1973)

61% (1977)

68% (1990)

56% (1987)