| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $18,402 | $12,369 |
| 2016 | $19,645 | $14,439 |
| 2017 | $19,700 | $14,570 |
| 2018 | $19,700 | $14,729 |
| 2019 | $21,771 | $15,988 |
| 2020 | $21,771 | $15,988 |
| 2021* | $21,832 | $16,162 |
| 2022* | $21,893 | $16,338 |
| 2023* | $21,954 | $16,517 |
| 2024* | $22,016 | $16,697 |
| 2025* | $22,078 | $16,879 |