| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $19,956 | $13,646 |
| 2016 | $20,794 | $14,342 |
| 2017 | $20,936 | $14,272 |
| 2018 | $20,936 | $14,854 |
| 2019 | $21,485 | $13,018 |
| 2020 | $21,806 | $13,339 |
| 2021* | $22,131 | $13,668 |
| 2022* | $22,461 | $14,006 |
| 2023* | $22,795 | $14,352 |
| 2024* | $23,135 | $14,707 |
| 2025* | $23,480 | $15,070 |