| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $19,120 | $14,706 |
| 2016 | $19,084 | $14,502 |
| 2017 | $19,334 | $15,024 |
| 2018 | $19,334 | $14,362 |
| 2019 | $19,459 | $14,991 |
| 2020 | $19,723 | $15,255 |
| 2021* | $19,851 | $15,523 |
| 2022* | $19,980 | $15,797 |
| 2023* | $20,110 | $16,075 |
| 2024* | $20,241 | $16,358 |
| 2025* | $20,372 | $16,646 |