| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $30,435 | $24,543 |
| 2016 | $30,524 | $24,914 |
| 2017 | $31,306 | $25,237 |
| 2018 | $31,306 | $24,730 |
| 2019 | $32,814 | $25,374 |
| 2020 | $33,153 | $25,713 |
| 2021* | $33,494 | $26,058 |
| 2022* | $33,839 | $26,407 |
| 2023* | $34,188 | $26,761 |
| 2024* | $34,540 | $27,119 |
| 2025* | $34,896 | $27,483 |