| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,240 | $15,342 |
| 2016 | $23,512 | $15,633 |
| 2017 | $23,688 | $17,911 |
| 2018 | $23,688 | $17,217 |
| 2019 | $23,865 | $13,705 |
| 2020 | $23,803 | $13,643 |
| 2021* | $23,982 | $13,582 |
| 2022* | $24,161 | $13,520 |
| 2023* | $24,343 | $13,460 |
| 2024* | $24,525 | $13,399 |
| 2025* | $24,709 | $13,339 |