| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $28,114 | $19,986 |
| 2016 | $28,544 | $20,683 |
| 2017 | $29,284 | $21,837 |
| 2018 | $29,284 | $19,615 |
| 2019 | $30,372 | $20,313 |
| 2020 | $30,721 | $20,662 |
| 2021* | $31,191 | $21,383 |
| 2022* | $31,668 | $22,129 |
| 2023* | $32,153 | $22,902 |
| 2024* | $32,645 | $23,701 |
| 2025* | $33,144 | $24,528 |