74% (1993)

65% (1992)

71% (1990)

60% (1993)

59% (1993)

62% (1986)

72% (1987)

65% (1992)

65% (1987)

43% (1988)

48% (1995)

57% (1993)

70% (1995)

51% (2006)

70% (1989)

69% (1995)

38% (1980)

69% (1994)

70% (1996)

67% (1989)