| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $29,748 | $17,609 |
| 2016 | $30,479 | $19,101 |
| 2017 | $30,839 | $18,395 |
| 2018 | $30,839 | $18,932 |
| 2019 | $32,404 | $20,669 |
| 2020 | $34,216 | $22,481 |
| 2021* | $35,058 | $24,385 |
| 2022* | $35,920 | $26,451 |
| 2023* | $36,804 | $28,691 |
| 2024* | $37,709 | $31,121 |
| 2025* | $38,637 | $33,757 |