| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $24,352 | $20,698 |
| 2016 | $25,628 | $20,730 |
| 2017 | $26,728 | $21,781 |
| 2018 | $26,728 | $21,048 |
| 2019 | $30,736 | $24,855 |
| 2020 | $29,078 | $23,197 |
| 2021* | $30,325 | $23,232 |
| 2022* | $31,626 | $23,267 |
| 2023* | $32,983 | $23,302 |
| 2024* | $34,398 | $23,336 |
| 2025* | $35,874 | $23,372 |