| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $22,576 | $15,419 |
| 2016 | $23,129 | $16,431 |
| 2017 | $23,633 | $16,921 |
| 2018 | $23,633 | $17,001 |
| 2019 | $23,590 | $16,061 |
| 2020 | $27,156 | $19,627 |
| 2021* | $27,748 | $20,212 |
| 2022* | $28,353 | $20,814 |
| 2023* | $28,971 | $21,434 |
| 2024* | $29,603 | $22,073 |
| 2025* | $30,248 | $22,731 |