50% (1956)

30% (1970)

60% (1990)

58% (1986)

0% (2001)

53% (1986)

75% (1985)

70% (1978)

90% (2002)

50% (1979)

55% (1986)

75% (1989)

0% (2001)

50% (1978)

50% (1979)

0% (1954)

85% (1992)

50% (1975)

50% (1960)

45% (1985)