75% (1993)

65% (1992)

60% (1993)

70% (1990)

59% (1993)

62% (1987)

63% (1986)

43% (1988)

67% (1989)

72% (1987)

70% (1992)

57% (1993)

75% (1986)

38% (1980)

57% (1986)

70% (1996)

69% (1994)

51% (2006)

48% (1995)

60% (1989)