Did 70% or 80% people from Shandong immigrate here?

Most of them are immigrants from other provinces.

Shandong people are not primitive Shandong people. They have undergone three major changes, most of them are immigrants from other provinces. Many waves of immigration in history are mostly related to war. There were three major wars that affected the large-scale migration tide in Shandong, namely Yongjia Rebellion, Anshi Rebellion and Jingkang Rebellion.

I hope my answer is useful to you.