55% (1990)

53% (1985)

44% (1985)

57% (1983)

50% (1985)

57% (1974)

55% (1971)

53% (1977)

42% (1989)

51% (1981)

67% (1984)

56% (1988)

30% (1983)

64% (1977)

43% (1988)

61% (1974)

57% (1976)

58% (1978)

47% (1975)

50% (1977)