71% (1989)

58% (1976)

41% (1978)

50% (1978)

39% (1977)

50% (1973)

50% (1973)

42% (1980)

54% (1972)

42% (1972)

48% (1980)

45% (1983)

46% (1983)

50% (1975)

42% (1975)

63% (1969)

53% (1971)

0% (1997)

40% (1990)

37% (1990)