| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,705 | $12,605 |
| 2016 | $23,110 | $13,382 |
| 2017 | $23,647 | $15,789 |
| 2018 | $23,647 | $16,262 |
| 2019 | $25,019 | $17,702 |
| 2020 | $24,914 | $17,597 |
| 2021* | $25,492 | $18,681 |
| 2022* | $26,083 | $19,832 |
| 2023* | $26,689 | $21,053 |
| 2024* | $27,308 | $22,350 |
| 2025* | $27,941 | $23,727 |