Well, if you think the 2020&2021 data is a special case. So let's look at the data for 2019.
In 2019, 703.5k students in China will study abroad. In the same year, 580.3k students returned home after graduation.
Chinese students usually study in the United States, Canada and Australia for 2 years. Let's look at the data of 2017.
In 2017, 608.4 people in China went abroad to study. In other words, 95.4%(580.3/608.4) of Chinese students returned home after graduation.
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