| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $27,138 | $19,875 |
| 2016 | $27,860 | $20,360 |
| 2017 | $29,226 | $20,905 |
| 2018 | $29,226 | $20,659 |
| 2019 | $29,166 | $19,648 |
| 2020 | $29,978 | $20,460 |
| 2021* | $30,775 | $20,959 |
| 2022* | $31,594 | $21,471 |
| 2023* | $32,434 | $21,995 |
| 2024* | $33,297 | $22,531 |
| 2025* | $34,183 | $23,081 |