| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,159 | $15,747 |
| 2016 | $23,790 | $15,734 |
| 2017 | $24,210 | $16,015 |
| 2018 | $24,210 | $15,975 |
| 2019 | $24,960 | $15,689 |
| 2020 | $25,720 | $16,449 |
| 2021* | $26,420 | $16,436 |
| 2022* | $27,138 | $16,423 |
| 2023* | $27,876 | $16,410 |
| 2024* | $28,635 | $16,396 |
| 2025* | $29,413 | $16,383 |