| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $16,653 | $11,469 |
| 2016 | $16,885 | $11,688 |
| 2017 | $18,169 | $12,988 |
| 2018 | $18,169 | $12,972 |
| 2019 | $18,634 | $10,852 |
| 2020 | $18,657 | $10,875 |
| 2021* | $18,916 | $10,898 |
| 2022* | $19,179 | $10,921 |
| 2023* | $19,446 | $10,944 |
| 2024* | $19,716 | $10,967 |
| 2025* | $19,990 | $10,990 |