| Recipient Residency | Year | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | |
| Total | 21,114 | 23,484 | 25,879 | 28,207 | 30,503 | 32,992 | 35,579 | 38,214 | 39,413 |
| U.S. Resident | 20,769 | 23,156 | 25,583 | 27,933 | 30,255 | 32,768 | 35,376 | 38,038 | 39,268 |
| Unknown | 345 | 328 | 296 | 274 | 248 | 224 | 203 | 176 | 145 |
| Total (%) | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| U.S. Resident | 98.4% | 98.6% | 98.9% | 99.0% | 99.2% | 99.3% | 99.4% | 99.5% | 99.6% |
| Unknown | 1.6% | 1.4% | 1.1% | 1.0% | 0.8% | 0.7% | 0.6% | 0.5% | 0.4% |