| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,188 | $15,581 |
| 2016 | $20,543 | $15,886 |
| 2017 | $21,332 | $16,481 |
| 2018 | $21,332 | $16,666 |
| 2019 | $22,897 | $17,704 |
| 2020 | $23,111 | $17,918 |
| 2021* | $23,518 | $18,269 |
| 2022* | $23,932 | $18,627 |
| 2023* | $24,353 | $18,992 |
| 2024* | $24,781 | $19,365 |
| 2025* | $25,218 | $19,744 |