| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $16,178 | $11,708 |
| 2016 | $17,141 | $12,507 |
| 2017 | $16,468 | $11,849 |
| 2018 | $16,468 | $12,102 |
| 2019 | $16,784 | $11,623 |
| 2020 | $17,677 | $12,516 |
| 2021* | $18,016 | $12,784 |
| 2022* | $18,362 | $13,057 |
| 2023* | $18,715 | $13,337 |
| 2024* | $19,074 | $13,622 |
| 2025* | $19,440 | $13,914 |