| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $28,520 | $23,789 |
| 2016 | $32,180 | $23,154 |
| 2017 | $27,640 | $19,702 |
| 2018 | $27,640 | $19,261 |
| 2019 | $28,180 | $23,477 |
| 2020 | $28,210 | $23,507 |
| 2021* | $28,241 | $22,980 |
| 2022* | $28,272 | $22,466 |
| 2023* | $28,303 | $21,962 |
| 2024* | $28,334 | $21,470 |
| 2025* | $28,365 | $20,990 |