The U.S. Department of Homeland Security (DHS) released the Fiscal Year (FY) 2017 Entry/Exit Overstay Report. More information is provided here:
The report provides data on departures and overstays, by country, for foreign visitors to the United States who entered as nonimmigrants through an air or sea Port of Entry (POE) and were expected to depart in FY 2017. The in-scope population for this report includes temporary workers and families, students, exchange visitors, temporary visitors for pleasure, temporary visitors for business, and other nonimmigrant classes of admission.
DHS has determined that there were 52,656,022 in-scope nonimmigrant admissions to the United States through air or sea POEs with expected departures occurring in FY 2017; the in-scope admissions represent the vast majority of all air and sea nonimmigrant admissions. Of this number, DHS calculated a total overstay rate of 1.33 percent, or 701,900 overstay events.
The report also breaks down the overstay rates further to provide a better picture of those overstays who remain in the United States beyond their period of admission and for whom there is no identifiable evidence of a departure, an extension of period of admission, or transition to another immigration status. At the end of FY 2017, there were 606,926 Suspected In-Country Overstays. The overall Suspected In-Country Overstay rate was 1.15 percent of the expected departures.
The U.S. government is using a multifaceted approach to enforce overstay violations, including improving entry and exit data collection and reporting, notifying visitors of an impending expiration of their authorized period of admission, cancelling travel authorizations and visas for violators, recurrent vetting of many nonimmigrants, and apprehending overstays present in the United States.
A further breakdown can be found below and the full report is available here.