71% (1984)

55% (1981)

70% (1978)

60% (1975)

60% (1971)

71% (1982)

60% (1975)

62% (1965)

59% (1983)

64% (1972)

70% (1976)

77% (1966)

77% (1975)

53% (1985)

52% (1968)

0% (1971)

0% (1990)

63% (1984)

40% (1970)

0% (2004)