| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $31,796 | $18,707 |
| 2016 | $32,190 | $19,397 |
| 2017 | $32,301 | $19,380 |
| 2018 | $32,301 | $18,706 |
| 2019 | $32,454 | $16,887 |
| 2020 | $33,165 | $17,598 |
| 2021* | $33,321 | $17,582 |
| 2022* | $33,477 | $17,566 |
| 2023* | $33,635 | $17,551 |
| 2024* | $33,793 | $17,535 |
| 2025* | $33,952 | $17,519 |
