Three years ago when I applied for Global Entry, same problem. I believe I put in Netherlands. During the interview mentioned that my passport had only entries from three countries stamped: Sint Maarten, St. Barths, and US. The interviewer stated that she was leaving for vacation to Sint Maarten in two weeks for her timeshare there, and the rest of the interview was spent comparing restaurants and places to visit. At the end of the interview she did ask some perfunctory questions which were already completed on the application.