| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $31,010 | $15,093 |
| 2016 | $33,690 | $21,816 |
| 2017 | $34,210 | $21,835 |
| 2018 | $34,210 | $19,865 |
| 2019 | $34,600 | $20,908 |
| 2020 | $34,670 | $20,978 |
| 2021* | $35,065 | $21,047 |
| 2022* | $35,465 | $21,117 |
| 2023* | $35,869 | $21,186 |
| 2024* | $36,278 | $21,256 |
| 2025* | $36,692 | $21,326 |