| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $16,735 | $11,462 |
| 2016 | $19,897 | $14,403 |
| 2017 | $19,917 | $14,159 |
| 2018 | $19,917 | $14,314 |
| 2019 | $21,243 | $15,348 |
| 2020 | $24,957 | $19,062 |
| 2021* | $26,619 | $20,438 |
| 2022* | $28,392 | $21,914 |
| 2023* | $30,283 | $23,496 |
| 2024* | $32,300 | $25,193 |
| 2025* | $34,451 | $27,011 |