| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $31,684 | $27,675 |
| 2016 | $29,671 | $25,493 |
| 2017 | $29,343 | $25,312 |
| 2018 | $29,343 | $25,742 |
| 2019 | $29,206 | $22,502 |
| 2020 | $25,969 | $19,265 |
| 2021* | $25,681 | $17,747 |
| 2022* | $25,396 | $16,348 |
| 2023* | $25,114 | $15,060 |
| 2024* | $24,835 | $13,873 |
| 2025* | $24,559 | $12,780 |
