54 (revised again)

	A	B	C	D
1	us_china_collabs	total	quant	date
2	4767	29365	0.1623361144	2020
3	4299	27896	0.1541081159	2019
4	3175	23470	0.1352790797	2018
5	2461	19971	0.1232286816	2017
6	1961	17278	0.1134969325	2016
7	1625	16106	0.1008940767	2015
8	1450	15206	0.09535709588	2014
9	1147	14031	0.08174755898	2013
10	938	13346	0.07028323093	2012
11	823	12962	0.06349328807	2011
12	707	12344	0.05727478937	2010
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100