| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $17,400 | $9,591 |
| 2016 | $17,600 | $8,453 |
| 2017 | $17,900 | $7,692 |
| 2018 | $17,900 | $7,466 |
| 2019 | $20,200 | $8,441 |
| 2020 | $20,200 | $8,441 |
| 2021* | $20,432 | $8,193 |
| 2022* | $20,667 | $7,952 |
| 2023* | $20,905 | $7,718 |
| 2024* | $21,145 | $7,491 |
| 2025* | $21,389 | $7,271 |