I'm not sure if the population is that much lower - certainly PSA pops are not much higher in 1961 vs., say 1956 or 1957
1956: 260,000
1957: 250,000
1961: 275,000
however, that is only graded population. It could be that there are a lot more ungraded 1961s because of lower value/interest.
I wonder if they're also plentiful (at least for acquisition by sale/trade) because, frankly, they're pretty ugly. As a player collector, I find that many players have their worst base card image in 1961 (e.g., Mays, Banks, Clemente). Many hatless shots, and just not a good looking design
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