| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $28,664 | $22,324 |
| 2016 | $29,330 | $22,364 |
| 2017 | $30,062 | $23,158 |
| 2018 | $30,062 | $22,389 |
| 2019 | $30,490 | $20,889 |
| 2020 | $31,250 | $21,649 |
| 2021* | $31,975 | $21,688 |
| 2022* | $32,717 | $21,727 |
| 2023* | $33,476 | $21,766 |
| 2024* | $34,252 | $21,805 |
| 2025* | $35,047 | $21,845 |