| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,661 | $15,064 |
| 2016 | $21,251 | $15,169 |
| 2017 | $21,131 | $14,752 |
| 2018 | $21,131 | $14,495 |
| 2019 | $21,211 | $10,397 |
| 2020 | $21,431 | $10,617 |
| 2021* | $21,512 | $10,432 |
| 2022* | $21,594 | $10,251 |
| 2023* | $21,676 | $10,072 |
| 2024* | $21,759 | $9,897 |
| 2025* | $21,841 | $9,725 |