Percentage of international collaboration articles involving the United States
| No. of Collaborating Countries/Regions | No. of International Collaborating Articles | No. of International Collaborating Articles Involving the United States | % of International Collaborating Articles Involving the United States | |
|---|---|---|---|---|
| 1980–1989 | 24 | 72 | 53 | 74% |
| 1990–1999 | 32 | 183 | 125 | 68% |
| 2000–2009 | 47 | 453 | 317 | 70% |
| 2010–2018 | 57 | 748 | 465 | 62% |