Challengers by country
France
36
Germany
32
Poland
24
Sweden
21
Denmark
15
Turkey
15
Spain
13
Netherlands
10
United Kingdom
7
Portugal
6
Norway
5
Greece
5
Russia
5
Croatia
5
Austria
4
Belgium
4
Romania
4
Bulgaria
4
South Korea
4
Slovakia
3
Estonia
3
Czech Republic
3
China
3
Finland
2
Hungary
2
Lithuania
2
Italy
2
Switzerland
2
Slovenia
1
Saudi Arabia
1
Morocco
1
Israel
1
Montenegro
1
Canada
1
Serbia
1
Bosnia and Herzegovina
1
Ukraine
1
Algeria
1
Albania
1
Australia
1