48% (1983)

47% (1975)

60% (1975)

42% (1978)

57% (1977)

47% (1976)

61% (1974)

48% (1977)

70% (1981)

49% (1975)

60% (1976)

56% (1977)

52% (1982)

55% (1978)

50% (1978)

57% (1990)

60% (1981)

50% (1976)

42% (1977)

40% (1978)