72% (1983)

74% (1981)

72% (1981)

50% (1981)

75% (1984)

34% (1986)

0% (1976)

0% (1974)

0% (1986)

73% (1975)

60% (1972)

0% (1980)

59% (1976)

0% (1973)

66% (1986)

53% (1970)

72% (1986)

73% (1993)

70% (1986)

49% (1988)