| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $26,436 | $19,766 |
| 2016 | $26,038 | $19,552 |
| 2017 | $26,774 | $19,584 |
| 2018 | $26,774 | $19,678 |
| 2019 | $27,977 | $20,328 |
| 2020 | $28,445 | $20,796 |
| 2021* | $28,920 | $20,896 |
| 2022* | $29,403 | $20,996 |
| 2023* | $29,894 | $21,097 |
| 2024* | $30,393 | $21,198 |
| 2025* | $30,901 | $21,300 |