| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $24,890 | $20,130 |
| 2016 | $26,410 | $20,718 |
| 2017 | $27,224 | $22,601 |
| 2018 | $27,224 | $23,314 |
| 2019 | $29,260 | $25,161 |
| 2020 | $30,377 | $26,278 |
| 2021* | $31,537 | $27,445 |
| 2022* | $32,742 | $28,663 |
| 2023* | $33,993 | $29,936 |
| 2024* | $35,291 | $31,265 |
| 2025* | $36,640 | $32,653 |