| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $26,204 | $20,940 |
| 2016 | $26,636 | $22,821 |
| 2017 | $27,140 | $21,282 |
| 2018 | $27,140 | $22,910 |
| 2019 | $30,664 | $27,569 |
| 2020 | $30,766 | $27,671 |
| 2021* | $31,274 | $29,788 |
| 2022* | $31,790 | $32,067 |
| 2023* | $32,314 | $34,520 |
| 2024* | $32,847 | $37,160 |
| 2025* | $33,389 | $40,003 |