Foederatio Internationalis Una Voce
Report for the Congregation for the Doctrine of the Faith
The Implementation of the Apostolic Letter Summorum Pontificumin Dioceses Around the World 2007-2020.
In 2020 the Federation presented this report to the Congregation for the Doctrine of the Faith, to complement reports sent by bishops around the world on the same subject, which had been requested by the CDF at the request of Pope Francis.
The Federation's Report will not be published in full but a good deal of material from it will be published in different places, and this page will be updated with links to these materials.
On the demographic profile of EF congregations, you can download a table of statistics here.
The Homiletic and Pastoral Review has a piece about the demographic profile of EF attendees, here. There is a brief notice and response to the article on the website of the German Bishops' Conference (in German) here.