This may be of interest:
No Catholic can say he knows how many times (total) a Pope or the Magisterium has spoken infallibly, as no infallible list of all such exists, nor can he say he infallibly understands what they declare.
[RC apologist Scott] Hahn has proposed a two-statement canon of ex cathedra papal statements. But apologist Tim Staples says there are at least four, and likely very many more. In his audio tape series, “All Generations Shall Call Me Blessed,” he berated those who state that popes have only spoken infallibly on two occasions. Staples mentioned the two ex cathedra statements to which Hahn refers, and then adds at least two more, referring first to pope Boniface VIII’s statement Unam Sanctam (1302), and second, to St. Leo’s letter to Flavian* which was examined and approved by the Council of Chalcedon in 451:
As evidence that the dilemma is not limited merely to a few teachings, the Roman Catholic is invited to consider the much longer list compiled by Roman Catholic priest Leslie Rumble in his book, That Catholic Church. In this book he provides his opinion that there have been 18 ex cathedra papal statements throughout Roman Catholic history. Not only does Rumble’s list contain considerably more statements than Hahn’s or Staples’, it also contains two caveats indicating that the degree of certainty of the reliability of this (or any) list is in doubted. - http://www.cwrc-rz.org/thlarchive/thla-024.php
Bishop Vincent Gasser, spokesman for the deputation “de fide” (the committee of Conciliar Fathers [in Vatican 1], charged with drafting the solemn definition [on Papal infalliblity]), and who is quoted no less than four times in the official footnotes to “Lumen Gentium” 25, which treats of infallibility, delivered a four-hour speech explaining and defending the draft which was submitted to the assembled Fathers for their vote.
Gasser stated:
“Already thousands and thousands of dogmatic judgments have gone forth from the apostolic See; by his audience— that there had already been “thousands and thousands” of infallible definitions issued by the Roman See.” http://www.orthodoxanswers.org/papalinfallibility.pdf
That is absolutely untrue. The Popes, collectively, have only ever issued two ex cathedra statements. That is verifiable.