| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $16,386 | $12,165 |
| 2016 | $16,762 | $12,917 |
| 2017 | $17,483 | $13,389 |
| 2018 | $17,483 | $13,583 |
| 2019 | $19,829 | $15,245 |
| 2020 | $20,399 | $15,815 |
| 2021* | $20,984 | $16,406 |
| 2022* | $21,587 | $17,020 |
| 2023* | $22,206 | $17,657 |
| 2024* | $22,844 | $18,317 |
| 2025* | $23,499 | $19,002 |