| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $19,499 | $10,644 |
| 2016 | $20,085 | $11,434 |
| 2017 | $20,659 | $12,199 |
| 2018 | $20,659 | $11,642 |
| 2019 | $19,937 | $10,596 |
| 2020 | $20,155 | $10,814 |
| 2021* | $20,375 | $11,037 |
| 2022* | $20,597 | $11,264 |
| 2023* | $20,821 | $11,496 |
| 2024* | $21,048 | $11,733 |
| 2025* | $21,278 | $11,975 |