According to a report from the Pew Research Center, the number of foreign college students staying and working in the U.S. after graduation has surged. Federal training program experienced a four-fold increase in foreign students graduating and working in STEM fields from 2008 to 2016.
The report can be obtained at http://assets.pewresearch.org/wp-content/uploads/sites/2/2018/05/10110621/Pew-Research-Center_Foreign-Student-Graduate-Workers-on-OPT_2018.05.10.pdf.