60% (1981)

40% (1992)

70% (1988)

30% (1973)

60% (1979)

0% (1980)

55% (1974)

57% (1973)

60% (1973)

58% (1972)

60% (1977)

47% (1986)

52% (1978)

0% (1983)

70% (1973)

35% (1975)