70% (2000)

65% (1996)

43% (1999)

63% (1996)

40% (1998)

70% (1987)

53% (1996)

60% (1997)

56% (1998)

44% (2000)

43% (1995)

45% (1995)

66% (1986)

43% (1998)

57% (1998)

52% (1993)

52% (1997)

51% (1998)

57% (2000)

52% (2001)