57% (1975)

65% (1983)

66% (1971)

60% (1985)

59% (1964)

30% (2000)

43% (1992)

10% (1977)

62% (1992)

42% (1976)

43% (1986)

42% (1970)

37% (2001)

58% (1977)

64% (1991)

55% (1974)

0% (2001)

52% (1986)

62% (1990)

0% (1999)