| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $24,422 | $16,859 |
| 2016 | $24,791 | $16,490 |
| 2017 | $25,037 | $16,483 |
| 2018 | $25,037 | $16,987 |
| 2019 | $27,917 | $19,689 |
| 2020 | $28,380 | $20,152 |
| 2021* | $28,809 | $20,626 |
| 2022* | $29,244 | $21,110 |
| 2023* | $29,685 | $21,606 |
| 2024* | $30,133 | $22,114 |
| 2025* | $30,588 | $22,634 |