| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $22,366 | $19,255 |
| 2016 | $22,366 | $18,984 |
| 2017 | $22,302 | $18,781 |
| 2018 | $22,302 | $19,047 |
| 2019 | $23,106 | $18,522 |
| 2020 | $23,431 | $18,847 |
| 2021* | $23,431 | $18,645 |
| 2022* | $23,431 | $18,446 |
| 2023* | $23,431 | $18,248 |
| 2024* | $23,431 | $18,053 |
| 2025* | $23,431 | $17,860 |