| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $21,676 | $17,418 |
| 2016 | $22,142 | $18,510 |
| 2017 | $22,142 | $17,242 |
| 2018 | $22,142 | $16,907 |
| 2019 | $24,731 | $19,426 |
| 2020 | $25,025 | $19,720 |
| 2021* | $25,323 | $20,018 |
| 2022* | $25,624 | $20,320 |
| 2023* | $25,929 | $20,627 |
| 2024* | $26,238 | $20,938 |
| 2025* | $26,550 | $21,255 |