70% (1973)

57% (1973)

57% (1973)

46% (1974)

33% (1992)

70% (1988)

60% (1981)

62% (1978)

47% (1986)

35% (1979)

20% (1983)

35% (1975)

54% (1972)

30% (1973)

60% (1977)

0% (1980)