| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $18,362 | $12,348 |
| 2016 | $20,078 | $13,889 |
| 2017 | $20,387 | $12,652 |
| 2018 | $20,387 | $13,167 |
| 2019 | $22,730 | $15,588 |
| 2020 | $21,849 | $14,707 |
| 2021* | $22,185 | $15,306 |
| 2022* | $22,527 | $15,929 |
| 2023* | $22,874 | $16,577 |
| 2024* | $23,226 | $17,251 |
| 2025* | $23,584 | $17,954 |