72% (1989)

58% (1976)

51% (1978)

39% (1977)

42% (1972)

40% (1978)

48% (1980)

42% (1975)

52% (1980)

45% (1983)

46% (1983)

50% (1973)

55% (1972)

54% (1972)

50% (1973)

50% (1973)

50% (1998)

53% (1971)

0% (1997)

50% (1975)