| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $18,816 | $13,690 |
| 2016 | $19,036 | $13,526 |
| 2017 | $20,736 | $15,455 |
| 2018 | $20,736 | $15,422 |
| 2019 | $19,454 | $14,133 |
| 2020 | $19,992 | $14,671 |
| 2021* | $20,226 | $14,640 |
| 2022* | $20,463 | $14,609 |
| 2023* | $20,702 | $14,579 |
| 2024* | $20,944 | $14,548 |
| 2025* | $21,189 | $14,518 |