| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $19,166 | $14,921 |
| 2016 | $19,258 | $14,732 |
| 2017 | $19,839 | $15,272 |
| 2018 | $19,839 | $15,355 |
| 2019 | $19,810 | $15,549 |
| 2020 | $19,888 | $15,627 |
| 2021* | $19,966 | $15,711 |
| 2022* | $20,043 | $15,796 |
| 2023* | $20,122 | $15,882 |
| 2024* | $20,200 | $15,967 |
| 2025* | $20,279 | $16,054 |