The US Department of State has published Table V Part 3 of the Report of the Visa Office 2017, which gives a tally of visas issued by country for the Employment Fifth preference (EB-5) in FY2017. If we believe USCIS processing times reports, these should be visas based on investments/petitions from 2015 or earlier. A few points to note:
Having issued slightly fewer than the annual EB-5 visa quota last year, DOS compensated by going slightly over the quota this year. Vietnam and Brazil are the countries with greatest increase in EB-5 visas issued between 2016 and 2017. South Korea showed the largest drop.