https://www.nytimes.com/interactive/2021/04/19/upshot/how-th...
Which is not small, but it bears out my anecdotal impression as an NYC resident- most of the people leaving are people who would have left in the next few years anyway, the pandemic just moved up their timeframe.
And no one moved to avoid the “egregious lockdowns”, it’s just that working from home is a lot harder in an NYC apartment compared to a house.
The question will be whether the usual cycle (of about the past 20 years) of an equal or larger cohort of young people move in to replace them.
ADDED: Manhattan is about half that percentage but, again, still a lot of cars and people.
And for context, the average US household owns about 1.9 cars. Not an apples-to-apples comparison, but its easy to see that NYC car ownership is MUCH lower than the nation on average. [https://www.bts.gov/archive/publications/highlights_of_the_2...]