| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $31,956 | $22,553 |
| 2016 | $29,932 | $20,477 |
| 2017 | $30,560 | $20,904 |
| 2018 | $30,560 | $18,374 |
| 2019 | $31,300 | $18,993 |
| 2020 | $31,500 | $19,193 |
| 2021* | $31,702 | $19,395 |
| 2022* | $31,904 | $19,598 |
| 2023* | $32,109 | $19,804 |
| 2024* | $32,314 | $20,012 |
| 2025* | $32,521 | $20,222 |
