| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $19,657 | $14,439 |
| 2016 | $19,997 | $13,578 |
| 2017 | $20,143 | $12,657 |
| 2018 | $20,143 | $13,114 |
| 2019 | $20,519 | $13,166 |
| 2020 | $20,544 | $13,191 |
| 2021* | $20,694 | $13,216 |
| 2022* | $20,845 | $13,241 |
| 2023* | $20,997 | $13,266 |
| 2024* | $21,150 | $13,292 |
| 2025* | $21,305 | $13,317 |