| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $30,494 | $23,858 |
| 2016 | $27,139 | $18,883 |
| 2017 | $28,926 | $16,078 |
| 2018 | $28,926 | $20,523 |
| 2019 | $30,236 | $20,009 |
| 2020 | $30,462 | $20,235 |
| 2021* | $30,690 | $19,729 |
| 2022* | $30,921 | $19,236 |
| 2023* | $31,153 | $18,755 |
| 2024* | $31,386 | $18,286 |
| 2025* | $31,622 | $17,829 |