| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,386 | $14,896 |
| 2016 | $23,992 | $14,766 |
| 2017 | $24,238 | $14,402 |
| 2018 | $24,238 | $15,694 |
| 2019 | $25,604 | $16,097 |
| 2020 | $26,230 | $16,723 |
| 2021* | $26,870 | $17,153 |
| 2022* | $27,526 | $17,594 |
| 2023* | $28,197 | $18,046 |
| 2024* | $28,885 | $18,510 |
| 2025* | $29,590 | $18,985 |