| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,084 | $15,739 |
| 2016 | $21,666 | $17,401 |
| 2017 | $25,200 | $19,277 |
| 2018 | $25,200 | $17,848 |
| 2019 | $25,550 | $17,999 |
| 2020 | $26,690 | $19,139 |
| 2021* | $27,880 | $20,350 |
| 2022* | $29,124 | $21,639 |
| 2023* | $30,423 | $23,008 |
| 2024* | $31,780 | $24,465 |
| 2025* | $33,197 | $26,013 |