| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $18,744 | $12,693 |
| 2016 | $18,880 | $13,283 |
| 2017 | $19,549 | $13,131 |
| 2018 | $19,549 | $13,059 |
| 2019 | $20,226 | $13,266 |
| 2020 | $20,897 | $13,937 |
| 2021* | $21,591 | $14,159 |
| 2022* | $22,308 | $14,384 |
| 2023* | $23,048 | $14,612 |
| 2024* | $23,813 | $14,845 |
| 2025* | $24,604 | $15,081 |