68% (1985)

69% (1981)

61% (1989)

75% (1982)

63% (1985)

71% (1988)

66% (1980)

62% (1987)

59% (1988)

78% (1986)

63% (1988)

73% (1987)

66% (2007)

66% (1991)

66% (1988)

45% (1989)

69% (1987)

66% (1989)

65% (1988)

62% (2016)