| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,096 | $14,027 |
| 2016 | $20,378 | $13,809 |
| 2017 | $20,436 | $13,897 |
| 2018 | $20,436 | $13,140 |
| 2019 | $19,928 | $11,817 |
| 2020 | $20,412 | $12,301 |
| 2021* | $20,469 | $12,110 |
| 2022* | $20,526 | $11,923 |
| 2023* | $20,584 | $11,738 |
| 2024* | $20,642 | $11,556 |
| 2025* | $20,699 | $11,377 |