Table 3.
Five most productive countries 2000–2009.
| Standard Competition Ranking | Country | Articles (%) |
|---|---|---|
| First | USA | 727 (39.1%) |
| Second | Japan | 140 (7.5%) |
| Third | China | 131 (7.0%) |
| Fourth | India | 111 (6.0%) |
| Fifth | South Korea | 98 (5.3%) |
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