| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $22,366 | $18,442 |
| 2016 | $22,366 | $17,690 |
| 2017 | $22,302 | $17,884 |
| 2018 | $22,302 | $18,022 |
| 2019 | $23,106 | $17,588 |
| 2020 | $23,431 | $17,913 |
| 2021* | $23,431 | $18,051 |
| 2022* | $23,431 | $18,190 |
| 2023* | $23,431 | $18,330 |
| 2024* | $23,431 | $18,471 |
| 2025* | $23,431 | $18,613 |