| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,616 | $12,167 |
| 2016 | $21,102 | $11,291 |
| 2017 | $21,399 | $12,994 |
| 2018 | $21,399 | $11,970 |
| 2019 | $23,867 | $13,867 |
| 2020 | $24,031 | $14,031 |
| 2021* | $24,370 | $14,197 |
| 2022* | $24,713 | $14,364 |
| 2023* | $25,062 | $14,534 |
| 2024* | $25,415 | $14,705 |
| 2025* | $25,774 | $14,879 |