| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $25,872 | $18,873 |
| 2016 | $25,852 | $19,287 |
| 2017 | $25,940 | $17,915 |
| 2018 | $25,940 | $16,110 |
| 2019 | $26,504 | $17,982 |
| 2020 | $27,138 | $18,616 |
| 2021* | $27,230 | $19,024 |
| 2022* | $27,323 | $19,440 |
| 2023* | $27,416 | $19,866 |
| 2024* | $27,509 | $20,301 |
| 2025* | $27,602 | $20,746 |