Total
| |
2001–2005
|
2006–2010
|
2011–2015
|
---|
Country
|
N of docs
|
%
|
a PPD
|
Country
|
N of docs
|
%
|
Country
|
N of docs
|
%
|
Country
|
N of docs
|
%
|
---|
USA
|
8735
|
38.49
|
−4.61
|
USA
|
2248
|
41.13
|
USA
|
2907
|
39.14
|
USA
|
3580
|
36.52
|
UK
|
1629
|
7.18
|
0.81
|
France
|
417
|
7.63
|
Germany
|
521
|
7.01
|
China
|
827
|
8.44
|
Japan
|
1581
|
6.97
|
0.03
|
UK
|
403
|
7.37
|
Japan
|
518
|
6.97
|
Japan
|
725
|
7.40
|
Germany
|
1544
|
6.80
|
0.18
|
Germany
|
388
|
7.10
|
UK
|
512
|
6.89
|
UK
|
714
|
7.28
|
France
|
1527
|
6.73
|
0.30
|
Japan
|
338
|
6.18
|
France
|
498
|
6.71
|
Germany
|
635
|
6.48
|
Spain
|
1251
|
5.51
|
0.81
|
Spain
|
297
|
5.43
|
Spain
|
423
|
5.70
|
France
|
612
|
6.24
|
China
|
1126
|
4.96
|
0.11
|
Canada
|
290
|
5.31
|
Canada
|
361
|
4.86
|
Spain
|
531
|
5.42
|
Canada
|
1091
|
4.81
|
0.74
|
Netherlands
|
205
|
3.75
|
Italy
|
298
|
4.01
|
Canada
|
440
|
4.49
|
Netherlands
|
911
|
4.01
|
1.43
|
Italy
|
160
|
2.93
|
Netherlands
|
279
|
3.76
|
Netherlands
|
427
|
4.36
|
Italy
|
859
|
3.79
|
1.35
|
Australia
|
150
|
2.74
|
China
|
237
|
3.19
|
Italy
|
401
|
4.09
|
Australia
|
734
|
3.23
|
1.32
|
Switzerland
|
128
|
2.34
|
Australia
|
225
|
3.03
|
Australia
|
359
|
3.66
|
Brazil
|
600
|
2.64
|
1.62
|
Belgium
|
87
|
1.59
|
Brazil
|
213
|
2.87
|
South Korea
|
315
|
3.21
|
Switzerland
|
541
|
2.38
|
1.65
|
Sweden
|
84
|
1.54
|
Switzerland
|
190
|
2.56
|
Brazil
|
313
|
3.19
|
South Korea
|
534
|
2.35
|
1.5
|
Denmark
|
83
|
1.52
|
Taiwan
|
149
|
2.01
|
Taiwan
|
296
|
3.02
|
Taiwan
|
509
|
2.24
|
0.76
|
Turkey
|
83
|
1.52
|
South Korea
|
148
|
1.99
|
Switzerland
|
223
|
2.28
|
-
N of docs = numbers of documents
-
a
PPD = Percentage point difference from 2001 to 2005 to 2011–2015