| Foal Crop | Registered Foals | Sires | 2nd Gen Sires | 3rd Gen Sires | 4th Gen Sires | 5th Gen Sires |
| 1970 | 24,365 | 4,617 | 1,674 | 621 | 312 | 179 |
| 1980 | 35,679 | 5,799 | 1,955 | 721 | 324 | 196 |
| 1990 | 44,142 | 6,675 | 1,957 | 695 | 333 | 191 |
| 2000 | 37,756 | 4,054 | 1,319 | 494 | 250 | 154 |
| 2010 | 28,420 | 2,740 | 816 | 307 | 156 | 104 |
| 2015 | 23,047 | 1,916 | 601 | 249 | 136 | 83 |
| 2016 | 22,680 | 1,758 | 564 | 237 | 126 | 77 |
| 2017 | 22,254 | 1,702 | 540 | 229 | 127 | 74 |
| 2018 | 21,287 | 1,618 | 512 | 219 | 122 | 73 |
| 2019 | 20,526 | 1,527 | 474 | 210 | 108 | 71 |
Source: The Jockey Club
Current through 9/18/2023