The site that I linked to in my other comment [0] claims that "No other country [than the USA] on earth incarcerates so many people without trial. While many countries around the world have rushed to adopt American style plea bargaining in recent years, not a single one uses it for such a large portion of cases."

If you follow the sources it takes you to this 80-page report, which I haven't read, but I assume the numbers are in there: https://www.fairtrials.org/articles/publications/the-disappe...

[0] https://news.ycombinator.com/item?id=35814578