| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $16,864 | $12,643 |
| 2016 | $17,321 | $12,871 |
| 2017 | $17,753 | $13,126 |
| 2018 | $17,753 | $12,925 |
| 2019 | $19,386 | $15,140 |
| 2020 | $19,980 | $15,734 |
| 2021* | $20,521 | $16,046 |
| 2022* | $21,078 | $16,363 |
| 2023* | $21,649 | $16,687 |
| 2024* | $22,235 | $17,018 |
| 2025* | $22,838 | $17,355 |