Here are the rankings of (not just math) journals employed by some countries:

 - [Brazil][1] (in Portuguese)

 - [Finland][2]
 
 - [Norway][3] 


  [1]: https://sucupira.capes.gov.br/sucupira/public/
  [2]: http://www.julkaisufoorumi.fi/en
  [3]: https://dbh.nsd.uib.no/publiseringskanaler/Forside.action?request_locale=en