| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $30,435 | $24,994 |
| 2016 | $30,524 | $24,567 |
| 2017 | $31,306 | $25,035 |
| 2018 | $31,306 | $24,839 |
| 2019 | $32,814 | $26,153 |
| 2020 | $33,153 | $26,492 |
| 2021* | $33,494 | $26,836 |
| 2022* | $33,839 | $27,185 |
| 2023* | $34,188 | $27,539 |
| 2024* | $34,540 | $27,897 |
| 2025* | $34,896 | $28,259 |