| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $14,722 | $9,510 |
| 2016 | $17,854 | $12,479 |
| 2017 | $18,008 | $12,855 |
| 2018 | $18,008 | $12,729 |
| 2019 | $18,837 | $12,675 |
| 2020 | $18,980 | $12,818 |
| 2021* | $19,143 | $12,963 |
| 2022* | $19,308 | $13,109 |
| 2023* | $19,474 | $13,257 |
| 2024* | $19,641 | $13,407 |
| 2025* | $19,810 | $13,559 |