| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $22,398 | $12,317 |
| 2016 | $23,039 | $12,430 |
| 2017 | $23,700 | $13,347 |
| 2018 | $23,700 | $12,702 |
| 2019 | $24,259 | $13,908 |
| 2020 | $24,555 | $14,204 |
| 2021* | $25,134 | $14,507 |
| 2022* | $25,728 | $14,816 |
| 2023* | $26,335 | $15,131 |
| 2024* | $26,956 | $15,453 |
| 2025* | $27,593 | $15,783 |