| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $29,922 | $25,279 |
| 2016 | $30,640 | $24,395 |
| 2017 | $30,454 | $23,869 |
| 2018 | $30,454 | $25,795 |
| 2019 | $31,674 | $22,368 |
| 2020 | $33,170 | $23,864 |
| 2021* | $33,966 | $23,349 |
| 2022* | $34,781 | $22,844 |
| 2023* | $35,616 | $22,351 |
| 2024* | $36,471 | $21,868 |
| 2025* | $37,346 | $21,396 |