Table 2. Top 10 countries for centrality.
| Rank | County | Centrality |
|---|---|---|
| 1 | USA | 0.86 |
| 2 | England | 0.27 |
| 3 | Germany | 0.15 |
| 4 | China | 0.13 |
| 5 | Canada | 0.13 |
| 6 | Australia | 0.11 |
| 7 | The Netherlands | 0.10 |
| 8 | Spain | 0.09 |
| 9 | Italy | 0.07 |
| 10 | Japan | 0.06 |
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