| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $18,655 | $13,180 |
| 2016 | $18,830 | $13,377 |
| 2017 | $21,977 | $16,524 |
| 2018 | $21,977 | $16,788 |
| 2019 | $22,441 | $16,407 |
| 2020 | $23,541 | $17,507 |
| 2021* | $24,038 | $17,787 |
| 2022* | $24,545 | $18,072 |
| 2023* | $25,063 | $18,361 |
| 2024* | $25,592 | $18,655 |
| 2025* | $26,132 | $18,953 |