| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $31,528 | $19,105 |
| 2016 | $32,200 | $20,130 |
| 2017 | $33,000 | $20,804 |
| 2018 | $33,000 | $20,461 |
| 2019 | $34,472 | $21,677 |
| 2020 | $34,830 | $22,035 |
| 2021* | $35,572 | $22,773 |
| 2022* | $36,330 | $23,536 |
| 2023* | $37,103 | $24,325 |
| 2024* | $37,894 | $25,139 |
| 2025* | $38,701 | $25,982 |