66% (1982)

72% (1989)

65% (1990)

75% (1980)

65% (1987)

61% (1986)

69% (1973)

55% (1999)

62% (1983)

55% (1980)

72% (1968)

60% (1996)

64% (1990)

59% (1980)

72% (1976)

59% (1982)

72% (1966)

63% (1976)

69% (1977)

63% (1980)