| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $18,209 | $12,441 |
| 2016 | $17,217 | $11,278 |
| 2017 | $17,766 | $11,390 |
| 2018 | $17,766 | $11,755 |
| 2019 | $19,465 | $13,857 |
| 2020 | $19,631 | $14,023 |
| 2021* | $19,798 | $14,191 |
| 2022* | $19,966 | $14,362 |
| 2023* | $20,136 | $14,534 |
| 2024* | $20,307 | $14,708 |
| 2025* | $20,480 | $14,885 |