| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $19,472 | $15,432 |
| 2016 | $19,408 | $15,087 |
| 2017 | $20,458 | $16,150 |
| 2018 | $20,458 | $16,273 |
| 2019 | $21,330 | $16,861 |
| 2020 | $22,187 | $17,718 |
| 2021* | $23,079 | $18,358 |
| 2022* | $24,007 | $19,020 |
| 2023* | $24,972 | $19,707 |
| 2024* | $25,976 | $20,418 |
| 2025* | $27,020 | $21,155 |