| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $32,418 | $28,910 |
| 2016 | $32,728 | $26,613 |
| 2017 | $34,300 | $27,375 |
| 2018 | $34,300 | $29,009 |
| 2019 | $35,640 | $29,556 |
| 2020 | $38,189 | $32,105 |
| 2021* | $39,682 | $33,023 |
| 2022* | $41,234 | $33,968 |
| 2023* | $42,846 | $34,939 |
| 2024* | $44,521 | $35,938 |
| 2025* | $46,262 | $36,966 |