| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $30,651 | $18,025 |
| 2016 | $31,251 | $18,661 |
| 2017 | $31,838 | $19,158 |
| 2018 | $31,838 | $18,634 |
| 2019 | $33,730 | $19,426 |
| 2020 | $33,355 | $19,051 |
| 2021* | $33,982 | $19,558 |
| 2022* | $34,621 | $20,078 |
| 2023* | $35,272 | $20,612 |
| 2024* | $35,935 | $21,160 |
| 2025* | $36,610 | $21,723 |