| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $18,292 | $12,736 |
| 2016 | $18,540 | $11,506 |
| 2017 | $19,212 | $12,067 |
| 2018 | $19,212 | $12,198 |
| 2019 | $20,282 | $13,044 |
| 2020 | $19,780 | $12,542 |
| 2021* | $20,049 | $12,679 |
| 2022* | $20,322 | $12,817 |
| 2023* | $20,598 | $12,957 |
| 2024* | $20,878 | $13,098 |
| 2025* | $21,162 | $13,241 |