| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,972 | $12,389 |
| 2016 | $21,236 | $12,384 |
| 2017 | $21,824 | $12,537 |
| 2018 | $21,824 | $12,848 |
| 2019 | $23,326 | $14,331 |
| 2020 | $23,652 | $14,657 |
| 2021* | $23,983 | $14,990 |
| 2022* | $24,319 | $15,330 |
| 2023* | $24,659 | $15,678 |
| 2024* | $25,005 | $16,034 |
| 2025* | $25,355 | $16,398 |
