| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $17,088 | $7,112 |
| 2016 | $17,888 | $11,332 |
| 2017 | $18,288 | $12,722 |
| 2018 | $18,288 | $9,236 |
| 2019 | $19,362 | $11,720 |
| 2020 | $19,812 | $12,170 |
| 2021* | $20,272 | $13,663 |
| 2022* | $20,742 | $15,340 |
| 2023* | $21,223 | $17,222 |
| 2024* | $21,716 | $19,335 |
| 2025* | $22,219 | $21,707 |