| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $26,304 | $18,205 |
| 2016 | $26,719 | $18,274 |
| 2017 | $27,469 | $18,813 |
| 2018 | $27,469 | $18,709 |
| 2019 | $28,819 | $19,485 |
| 2020 | $28,827 | $19,493 |
| 2021* | $29,282 | $19,567 |
| 2022* | $29,745 | $19,641 |
| 2023* | $30,215 | $19,716 |
| 2024* | $30,693 | $19,791 |
| 2025* | $31,177 | $19,866 |