One additional thing to keep in mind is how saints were canonized. For about the first 1000 years of the Church, saints were usually named by the local bishops or patriarchs and were venerated only within that territory. The Pope could act to make a saint universal so he or she could be venerated everywhere, if he thought the saint was important enough. Nevertheless it was pretty easy to declare new saints, so there were lots of saints.
Then between about 900 and 1650, the Church gradually reserved more and more of the saint-making power to the Holy See (Pope) because of some abuses by the bishops in who got declared a local saint. There was then a pretty rigorous canonization process put in place from about 1700 to the early 1980s that made it much harder to canonize new saints. So for several hundred years, one sees fewer saints being canonized.
The process was revised in 1983 to make it easier to canonize saints. So the result is that in recent years Popes have been canonizing a lot more saints overall than they did in the previous centuries, at least back to the 1600s.