Solid figures are hard to come by for Euro comics due to the lack of a direct market but from what ive been able to scrape together for the French market...
Heres a report from Bleeding Cool from 2013 detailing some sales percentages;
http://www.bleedingcool.com/2014/01/...uite-a-bit-is/
Just over 5000 titles published in 2013, with 3800 being new material. 40% of that is manga, so thats a huge chunk surprisingly, with 39% being French-Belgian comics and 10% american comics.
Top 3 publishers by revenue were Dargaud, Glenet and Delcourt.
Latest Asterix sold just under 2.5 million copies
Blake & Mortimer Vol 22 : 445'000 copies.
Le Chat vol 18: 350'000
XIII Vol. 22 : 250'000
Blacksad Vol. 5 : 220'000
Thargol vol. 34 : 200'000
Boule et Bill vol. 34 :180'000
Jokes Toto vol. 10 : 180'000
Legendary Vol. 16 : 170'000
Nombrils Vol. 6 : 170'000
The Sisters Vol. 8 : 180'000
XIII Mystery Vol. 6 : 150'000
The Worlds of Thorgal: Youth Vol. 2 : 140'000
Les Profs Vol. 16 : 125'000
Top selling US comic is Walking Dead with two unspecified volumes hitting 200'000 and 100'000 copies.
Four unspecified Naruto vols sell 200'000 each.
Numerous One Piece/Fairy Tail volumes selling 90-170'000 each.
Various newstand editions of Marvel/DC titles selling 15'000-30'000 copies each.
Report claiming French comic market is worth just under $460 million in 2014;
http://www.publishersweekly.com/pw/b...ic-novels.html
Comics make up 12.5% of all published books in France.
An older post detailing stats from 2007;
http://comipress.com/article/2008/11/30/3705.html
Worth keeping in mind thats thats just France. No accounting for the entire euro-industry which seems even harder to find info for...