Summary
| Russia / USSR | United States | China | Total | |
| 1961–1970 | 16 | 25 | 41 | |
| 1971–1980 | 30 | 8 | 38 | |
| 1981–1990 | 24 | 37 | 61 | |
| 1991–2000 | 20 | 63 | 83 | |
| 2001–2010 | 22 | 34 | 3 | 59 |
| 2011–2020 | 7 | 3 | 1 | 11 |
| Total | 119 | 170 | 4 | 293 |
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