How many people moved from Henan to Henan and Shaanxi?

The most important immigrants from Henan and Shaanxi in the past century should be the victims who fled because of Huayuankou (my grandparents fled to xi 'an that year), and the entire fleeing population is estimated to be around three or four million. There are many Henan people (including descendants) in Shaanxi today. According to statistics, one third of them come from Xi, Weinan and Xianyang, and more than half come from Baoji and Tianshui.