35% (1979)

36% (1976)

65% (1970)

68% (1979)

80% (1991)

56% (1970)

67% (1970)

0% (1994)

34% (1989)

59% (1976)

67% (1968)

60% (1972)

65% (1979)

50% (1955)

70% (1993)

20% (1992)

40% (1974)

56% (1975)

64% (1970)

60% (1973)