56% (1975)

57% (1980)

39% (1976)

48% (1980)

47% (1991)

61% (1997)

20% (2002)

71% (2003)

52% (1980)

54% (1980)

33% (1976)

50% (1991)

42% (1977)

55% (1984)

48% (1980)

55% (1973)

58% (1974)

41% (1983)

65% (1976)

0% (1976)