What is the difference between American immigrants before and now?

Less than 5% of the people who got the green card before got back 0% of the investment principal. After 2003, the American government revised the law. At present, the number of people who get green cards has increased, but the number of people who get books back is still very low. Because the companies that started business after 2003 just got green cards, the enterprises they invested in are in a bad economy at present, so it is good to survive and unable to pay their debts.