| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $19,455 | $14,576 |
| 2016 | $19,854 | $14,765 |
| 2017 | $20,278 | $14,891 |
| 2018 | $20,278 | $14,795 |
| 2019 | $21,339 | $15,367 |
| 2020 | $21,444 | $15,472 |
| 2021* | $21,884 | $15,604 |
| 2022* | $22,332 | $15,736 |
| 2023* | $22,790 | $15,870 |
| 2024* | $23,257 | $16,005 |
| 2025* | $23,734 | $16,141 |