| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $25,579 | $16,261 |
| 2016 | $25,847 | $16,619 |
| 2017 | $27,037 | $17,268 |
| 2018 | $27,037 | $17,307 |
| 2019 | $27,912 | $17,411 |
| 2020 | $28,664 | $18,163 |
| 2021* | $29,435 | $18,563 |
| 2022* | $30,227 | $18,971 |
| 2023* | $31,040 | $19,388 |
| 2024* | $31,875 | $19,815 |
| 2025* | $32,732 | $20,251 |