| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $26,571 | $20,028 |
| 2016 | $26,288 | $20,350 |
| 2017 | $27,062 | $20,935 |
| 2018 | $27,062 | $21,270 |
| 2019 | $28,829 | $22,571 |
| 2020 | $29,121 | $22,863 |
| 2021* | $29,415 | $23,231 |
| 2022* | $29,712 | $23,605 |
| 2023* | $30,012 | $23,985 |
| 2024* | $30,315 | $24,371 |
| 2025* | $30,622 | $24,764 |
