What is the basis for saying that the Catholic Church is the largest charitable organization in the world?

I would prefer actual numbers comparing it to other organizations. In addition, bonus points if you can demonstrate that the catholic church effectively does the most good or essentially highly efficient with how they spend their money. It is quite irrelevant if someone receives lots of donations but does not spend the money well. None of the links in the following question seemed to work or seemed highly speculative to me (the economist answer). [This question](https://christianity.stackexchange.com/questions/6623/approximate-amount-of-money-per-year-the-catholic-church-spends-for-charity) is related. [This is](https://web.archive.org/web/20081227021108/http://www.catholicscomehome.org/epic/Epic_%20proof.pdf) is a source I found online; I'm not sure what to think of it though.