| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $25,180 | $16,683 |
| 2016 | $24,940 | $16,218 |
| 2017 | $25,446 | $16,639 |
| 2018 | $25,446 | $17,077 |
| 2019 | $26,936 | $16,375 |
| 2020 | $27,600 | $17,039 |
| 2021* | $28,160 | $17,482 |
| 2022* | $28,732 | $17,937 |
| 2023* | $29,315 | $18,403 |
| 2024* | $29,910 | $18,881 |
| 2025* | $30,517 | $19,372 |