| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,949 | $15,269 |
| 2016 | $24,321 | $16,210 |
| 2017 | $23,296 | $15,064 |
| 2018 | $23,296 | $15,118 |
| 2019 | $23,688 | $14,928 |
| 2020 | $24,187 | $15,427 |
| 2021* | $24,562 | $15,483 |
| 2022* | $24,943 | $15,538 |
| 2023* | $25,329 | $15,594 |
| 2024* | $25,722 | $15,650 |
| 2025* | $26,121 | $15,707 |