72% (1992)

69% (1986)

74% (1966)

58% (1989)

57% (1983)

70% (1997)

74% (1958)

0% (1980)

61% (1980)

79% (1974)

72% (1982)

70% (1998)

58% (1985)

53% (1970)

50% (1958)

43% (1989)

63% (1973)

65% (1961)

70% (1968)

67% (1987)