| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $18,317 | $14,364 |
| 2016 | $18,992 | $13,658 |
| 2017 | $19,543 | $14,018 |
| 2018 | $19,543 | $13,494 |
| 2019 | $20,879 | $13,736 |
| 2020 | $21,406 | $14,263 |
| 2021* | $22,027 | $14,518 |
| 2022* | $22,666 | $14,778 |
| 2023* | $23,323 | $15,043 |
| 2024* | $23,999 | $15,312 |
| 2025* | $24,695 | $15,586 |