75% (1974)

76% (1969)

56% (1975)

52% (1983)

53% (1996)

59% (1968)

50% (1969)

43% (1993)

59% (1970)

64% (1974)

48% (1973)

60% (1973)

46% (1973)

63% (1977)

30% (1974)

53% (1974)

48% (1983)

42% (1988)

53% (1973)

43% (1977)