2000-1-5

2000-1-10

1

25

2000-2-4

2000-2-10

0

31

2000-3-2

2000-3-7

0

29

2000-4-3

2000-4-8

0

27

2000-5-6

2000-5-12

2

32

2000-6-2

2000-6-8

1

28