74% (1987)

71% (1991)

60% (1990)

63% (1990)

69% (1987)

77% (1988)

64% (1986)

49% (1993)

84% (1991)

67% (1980)

66% (2007)

72% (1985)

70% (1981)

64% (1986)

65% (1988)

71% (1988)

59% (1997)

69% (1989)

53% (1990)

71% (1986)