| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $25,375 | $17,753 |
| 2016 | $26,310 | $19,719 |
| 2017 | $27,020 | $19,909 |
| 2018 | $27,020 | $20,357 |
| 2019 | $28,845 | $20,885 |
| 2020 | $29,836 | $21,876 |
| 2021* | $30,862 | $22,443 |
| 2022* | $31,924 | $23,024 |
| 2023* | $33,022 | $23,620 |
| 2024* | $34,158 | $24,232 |
| 2025* | $35,333 | $24,860 |