| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,673 | $16,574 |
| 2016 | $24,261 | $16,904 |
| 2017 | $24,918 | $17,314 |
| 2018 | $24,918 | $17,269 |
| 2019 | $25,393 | $17,248 |
| 2020 | $25,418 | $17,273 |
| 2021* | $25,903 | $17,297 |
| 2022* | $26,398 | $17,321 |
| 2023* | $26,902 | $17,346 |
| 2024* | $27,416 | $17,370 |
| 2025* | $27,940 | $17,394 |