| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,417 | $17,443 |
| 2016 | $23,806 | $17,767 |
| 2017 | $24,377 | $19,145 |
| 2018 | $24,377 | $18,727 |
| 2019 | $24,981 | $18,752 |
| 2020 | $24,572 | $18,343 |
| 2021* | $24,980 | $18,367 |
| 2022* | $25,395 | $18,391 |
| 2023* | $25,816 | $18,415 |
| 2024* | $26,245 | $18,439 |
| 2025* | $26,680 | $18,463 |