| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,339 | $17,569 |
| 2016 | $23,415 | $17,704 |
| 2017 | $23,109 | $17,960 |
| 2018 | $23,109 | $17,199 |
| 2019 | $23,853 | $16,990 |
| 2020 | $24,270 | $17,407 |
| 2021* | $24,350 | $17,541 |
| 2022* | $24,430 | $17,676 |
| 2023* | $24,511 | $17,812 |
| 2024* | $24,592 | $17,949 |
| 2025* | $24,673 | $18,088 |