| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $27,043 | $18,593 |
| 2016 | $27,127 | $18,313 |
| 2017 | $27,470 | $18,604 |
| 2018 | $27,470 | $18,021 |
| 2019 | $29,803 | $20,736 |
| 2020 | $31,804 | $22,737 |
| 2021* | $32,205 | $23,099 |
| 2022* | $32,611 | $23,466 |
| 2023* | $33,021 | $23,839 |
| 2024* | $33,437 | $24,218 |
| 2025* | $33,859 | $24,603 |