| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $21,328 | $13,153 |
| 2016 | $21,595 | $13,871 |
| 2017 | $22,625 | $14,208 |
| 2018 | $22,625 | $14,496 |
| 2019 | $23,791 | $14,399 |
| 2020 | $25,935 | $16,543 |
| 2021* | $27,172 | $16,945 |
| 2022* | $28,468 | $17,357 |
| 2023* | $29,826 | $17,779 |
| 2024* | $31,249 | $18,211 |
| 2025* | $32,739 | $18,653 |