60% (1997)

56% (2000)

59% (2001)

47% (1991)

49% (1993)

55% (2002)

37% (1995)

53% (1993)

54% (1998)

50% (1991)

52% (1999)

51% (2000)

45% (1995)

52% (1996)

44% (1991)

68% (2000)

58% (1998)

54% (1995)

54% (1997)

54% (1988)