| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $25,291 | $19,631 |
| 2016 | $26,426 | $20,238 |
| 2017 | $27,278 | $21,192 |
| 2018 | $27,278 | $21,071 |
| 2019 | $26,713 | $19,658 |
| 2020 | $29,732 | $22,677 |
| 2021* | $30,689 | $23,378 |
| 2022* | $31,678 | $24,100 |
| 2023* | $32,698 | $24,845 |
| 2024* | $33,750 | $25,612 |
| 2025* | $34,837 | $26,404 |