| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $17,355 | $13,406 |
| 2016 | $17,249 | $12,781 |
| 2017 | $15,312 | $11,107 |
| 2018 | $15,312 | $11,003 |
| 2019 | $16,275 | $10,816 |
| 2020 | $14,677 | $9,218 |
| 2021* | $14,587 | $8,788 |
| 2022* | $14,498 | $8,379 |
| 2023* | $14,410 | $7,988 |
| 2024* | $14,322 | $7,616 |
| 2025* | $14,235 | $7,261 |
