| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $22,452 | $13,491 |
| 2016 | $22,844 | $15,347 |
| 2017 | $22,996 | $15,211 |
| 2018 | $22,996 | $15,638 |
| 2019 | $23,164 | $14,267 |
| 2020 | $24,463 | $15,566 |
| 2021* | $24,642 | $16,003 |
| 2022* | $24,821 | $16,453 |
| 2023* | $25,003 | $16,915 |
| 2024* | $25,185 | $17,391 |
| 2025* | $25,369 | $17,879 |