67% (1986)

72% (1996)

60% (2008)

53% (1986)

49% (1993)

52% (1985)

58% (1997)

67% (1999)

62% (1990)

68% (1983)

63% (1981)

64% (1991)

35% (2006)

84% (1980)

68% (1988)

45% (1993)

80% (1981)

75% (1983)

25% (1990)

80% (1987)