| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $28,533 | $18,606 |
| 2016 | $28,810 | $19,119 |
| 2017 | $29,780 | $20,507 |
| 2018 | $29,780 | $20,271 |
| 2019 | $31,706 | $20,782 |
| 2020 | $33,480 | $22,556 |
| 2021* | $34,608 | $23,179 |
| 2022* | $35,775 | $23,818 |
| 2023* | $36,980 | $24,476 |
| 2024* | $38,226 | $25,151 |
| 2025* | $39,515 | $25,845 |