| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $28,700 | $17,025 |
| 2016 | $29,400 | $21,330 |
| 2017 | $29,678 | $20,977 |
| 2018 | $29,678 | $21,264 |
| 2019 | $31,147 | $21,694 |
| 2020 | $31,209 | $21,756 |
| 2021* | $31,505 | $22,054 |
| 2022* | $31,805 | $22,356 |
| 2023* | $32,107 | $22,662 |
| 2024* | $32,412 | $22,973 |
| 2025* | $32,720 | $23,288 |