| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $24,916 | $18,408 |
| 2016 | $27,002 | $20,487 |
| 2017 | $27,336 | $20,583 |
| 2018 | $27,336 | $20,564 |
| 2019 | $29,150 | $22,345 |
| 2020 | $28,960 | $22,155 |
| 2021* | $29,319 | $22,259 |
| 2022* | $29,683 | $22,364 |
| 2023* | $30,051 | $22,469 |
| 2024* | $30,423 | $22,574 |
| 2025* | $30,801 | $22,681 |