| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $24,341 | $18,934 |
| 2016 | $24,551 | $19,093 |
| 2017 | $25,408 | $20,101 |
| 2018 | $25,408 | $19,928 |
| 2019 | $26,546 | $19,688 |
| 2020 | $26,993 | $20,135 |
| 2021* | $27,446 | $20,304 |
| 2022* | $27,908 | $20,475 |
| 2023* | $28,376 | $20,647 |
| 2024* | $28,853 | $20,820 |
| 2025* | $29,338 | $20,995 |