| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $22,073 | $12,922 |
| 2016 | $22,768 | $12,937 |
| 2017 | $23,732 | $14,531 |
| 2018 | $23,732 | $15,581 |
| 2019 | $24,116 | $14,424 |
| 2020 | $24,747 | $15,055 |
| 2021* | $25,395 | $15,713 |
| 2022* | $26,061 | $16,400 |
| 2023* | $26,744 | $17,116 |
| 2024* | $27,444 | $17,864 |
| 2025* | $28,163 | $18,645 |