57% (1980)

47% (1991)

40% (1976)

54% (1980)

48% (1980)

55% (1973)

50% (1979)

42% (1974)

41% (1983)

46% (1977)

53% (1975)

55% (1984)

50% (1976)

0% (1976)

61% (1997)

65% (1976)

42% (1977)

58% (1974)

20% (2002)

51% (1976)