76% (1980)

66% (1982)

72% (1989)

65% (1990)

65% (1987)

70% (1973)

62% (1983)

64% (1990)

72% (1976)

56% (1999)

61% (1986)

55% (1980)

64% (1988)

72% (1966)

72% (1968)

61% (1996)

60% (1980)

63% (1978)

63% (1976)

70% (1972)