| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $28,576 | $23,084 |
| 2016 | $28,386 | $24,037 |
| 2017 | $30,478 | $25,876 |
| 2018 | $30,478 | $25,767 |
| 2019 | $36,330 | $30,514 |
| 2020 | $37,593 | $31,777 |
| 2021* | $38,901 | $33,093 |
| 2022* | $40,255 | $34,463 |
| 2023* | $41,656 | $35,889 |
| 2024* | $43,105 | $37,375 |
| 2025* | $44,606 | $38,923 |