Whatever the exact number, the exodus — which began when COVID-19 hit the city in early spring — is much greater than in prior years. From just March through July, there were 244,895 change of address requests to destinations outside the city, more than double the 101,342 during the same period in 2019.
https://nypost.com/2020/11/14/new-stats-reveal-massive-nyc-exodus-amid-coronavirus-crime/