| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,264 | $13,546 |
| 2016 | $19,323 | $12,779 |
| 2017 | $19,915 | $12,553 |
| 2018 | $19,915 | $11,855 |
| 2019 | $20,555 | $13,411 |
| 2020 | $20,858 | $13,714 |
| 2021* | $21,165 | $13,471 |
| 2022* | $21,476 | $13,233 |
| 2023* | $21,791 | $12,999 |
| 2024* | $22,112 | $12,769 |
| 2025* | $22,437 | $12,543 |