Rank | Country | Count | Year | Centrality |
---|---|---|---|---|
1 | USA | 125 | 1996 | 0.44 |
2 | China | 73 | 2010 | 0.12 |
3 | Canada | 45 | 2004 | 0.13 |
4 | Italy | 37 | 2005 | 0.05 |
5 | Germany | 35 | 2001 | 0.01 |
6 | Brazil | 31 | 2008 | 0.01 |
7 | France | 27 | 2004 | 0.12 |
8 | Japan | 27 | 2009 | 0.07 |
9 | Netherlands | 23 | 2008 | 0.11 |
10 | Australia | 22 | 2001 | 0.13 |