| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,249 | $15,037 |
| 2016 | $21,000 | $15,590 |
| 2017 | $21,849 | $16,667 |
| 2018 | $21,849 | $15,456 |
| 2019 | $23,473 | $16,451 |
| 2020 | $23,948 | $16,926 |
| 2021* | $24,836 | $17,549 |
| 2022* | $25,758 | $18,195 |
| 2023* | $26,714 | $18,864 |
| 2024* | $27,705 | $19,558 |
| 2025* | $28,732 | $20,278 |