57% (1980)

55% (1973)

40% (1976)

50% (1983)

47% (1991)

41% (1983)

50% (1991)

48% (1980)

40% (1980)

53% (1975)

50% (1976)

54% (1980)

33% (1976)

58% (1974)

50% (1979)

42% (1974)

62% (1975)

61% (1997)

20% (2002)

56% (1975)