| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $18,900 | $10,429 |
| 2016 | $19,600 | $10,628 |
| 2017 | $19,100 | $6,115 |
| 2018 | $19,100 | $10,288 |
| 2019 | $19,100 | $8,993 |
| 2020 | $19,200 | $9,093 |
| 2021* | $19,200 | $9,194 |
| 2022* | $19,200 | $9,296 |
| 2023* | $19,200 | $9,399 |
| 2024* | $19,200 | $9,504 |
| 2025* | $19,200 | $9,609 |