75% (1980)

72% (1989)

65% (1982)

65% (1990)

62% (1983)

72% (1968)

72% (1976)

56% (1999)

61% (1986)

64% (1990)

65% (1987)

72% (1966)

59% (1980)

69% (1973)

61% (1996)

62% (1978)

47% (1995)

63% (1988)

70% (1972)

55% (1980)