I don't know what happened in 1964.
But a few dates ago watching this video about Garabandal that I recommend:
https://youtu.be/pYrSSf7VejM?t=393
They comment in the 6:33rd minute that vocations in Spain went from 8000 annually to 1000 per year
This is a decrease figure of -87.50%
It is not the figure itself, that 1000 vocations per year is well
It's the fact that...
What was done before, which may have been missing since then
References:
Catechism of the Catholic Church click here
864 "Christ, sent by the Father, is the source of the Church's whole apostolate"; thus the fruitfulness of apostolate for ordained ministers as well as for lay people clearly depends on their vital union with Christ.378 In keeping with their vocations, the demands of the times and the various gifts of the Holy Spirit, the apostolate assumes the most varied forms. But charity, drawn from the Eucharist above all, is always "as it were, the soul of the whole apostolate."379
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