73% (1987)

63% (2000)

67% (1980)

60% (1986)

76% (1986)

69% (1987)

40% (1982)

70% (1988)

79% (1984)

77% (1996)

37% (1998)

72% (1995)

70% (1981)

60% (1985)

62% (1996)

66% (1986)

60% (1993)

69% (1990)

63% (1992)

70% (1992)