| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $28,015 | $18,714 |
| 2016 | $28,989 | $20,155 |
| 2017 | $29,669 | $20,473 |
| 2018 | $29,669 | $20,651 |
| 2019 | $30,221 | $19,419 |
| 2020 | $31,153 | $20,351 |
| 2021* | $31,885 | $20,673 |
| 2022* | $32,634 | $20,999 |
| 2023* | $33,401 | $21,331 |
| 2024* | $34,186 | $21,668 |
| 2025* | $34,990 | $22,010 |