At end of 2018, US prisoner population (federal and state) was 1,465,200. Assume this hasn't changed too much in past year.
172,401 / 1,465, 200 = 11.8%
Roughly speaking, we're looking at a 12% (and growing) increase in the prison population.
Sauce: https://www.bjs.gov/content/pub/pdf/p18_sum.pdf