| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $19,153 | $12,557 |
| 2016 | $18,852 | $12,690 |
| 2017 | $19,284 | $13,295 |
| 2018 | $19,284 | $13,598 |
| 2019 | $20,222 | $14,057 |
| 2020 | $20,443 | $14,278 |
| 2021* | $20,666 | $14,604 |
| 2022* | $20,891 | $14,936 |
| 2023* | $21,119 | $15,277 |
| 2024* | $21,349 | $15,625 |
| 2025* | $21,582 | $15,982 |