| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,124 | $17,094 |
| 2016 | $23,551 | $17,355 |
| 2017 | $24,131 | $17,515 |
| 2018 | $24,131 | $17,054 |
| 2019 | $25,507 | $16,759 |
| 2020 | $25,254 | $16,506 |
| 2021* | $25,721 | $16,257 |
| 2022* | $26,197 | $16,011 |
| 2023* | $26,682 | $15,770 |
| 2024* | $27,175 | $15,531 |
| 2025* | $27,678 | $15,297 |