64% (1996)

70% (2000)

53% (1997)

43% (1999)

63% (2000)

52% (2001)

43% (1995)

70% (1987)

44% (2000)

52% (1997)

56% (1998)

48% (1998)

60% (1998)

53% (1996)

42% (1993)

53% (1992)

42% (1995)

52% (1999)

41% (2000)

50% (1996)