| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $19,204 | $14,031 |
| 2016 | $19,459 | $14,358 |
| 2017 | $19,784 | $14,256 |
| 2018 | $19,784 | $13,906 |
| 2019 | $19,536 | $13,496 |
| 2020 | $20,477 | $14,437 |
| 2021* | $20,749 | $14,334 |
| 2022* | $21,025 | $14,233 |
| 2023* | $21,305 | $14,132 |
| 2024* | $21,588 | $14,031 |
| 2025* | $21,875 | $13,932 |