64% (1997)

62% (1995)

52% (1991)

40% (1990)

44% (1994)

30% (1992)

73% (2012)

50% (1995)

36% (1997)

56% (1999)

50% (1999)

40% (1998)

43% (1999)

30% (1999)

67% (1987)

70% (1997)

45% (2000)

42% (1992)

55% (1993)

30% (1991)