The U.S. immigration system is quota-based, meaning there are generally limits on how many visas may be allocated in a year. There are approximately 10,000 visas available a year in the EB-5 category. Whenever demand by visa applicants exceeds the supply of visas, there is a backlog. While there have been long-standing backlogs in other green card categories, the backlog in the EB-5 category is relatively recent, having onset in mid-2015. Currently, there is a visa backlog for nationals from China and Vietnam. A visa backlog for Indian nationals is expected in Fiscal Year 2019 (ending September 30, 2019).