Many requested a 1990-2000 list. Any suggestions?
Breakdown (a, b, c)
Austria b_1 + c_2 
Belgium a_3 + b_2 
Canada a_3 + b_4 + c_1 
Iceland a_1 + c_1 
Finland a_1 + c_1 
France a_5 + b_7 
New Zealand c_1
Poland b_1 + c_1 
Spain a_3 + b_3 
South Korea b_3
United Kingdom a_3 + b_9 + c_2 
United States a_6 + b_17 + c_6 
Contemporary horror is mostly American, British, French, and Canadian [63 overall]
Some countries of origin should be taken with a grain of salt: for instance, Yorgos Lanthimos's masterpiece The Killing of a Sacred Deer is listed as "Irish" on MUBI.
Italian horror, where are thou?