| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,322 | $12,656 |
| 2016 | $19,245 | $11,442 |
| 2017 | $19,381 | $11,797 |
| 2018 | $19,381 | $11,630 |
| 2019 | $20,633 | $12,067 |
| 2020 | $20,761 | $12,195 |
| 2021* | $20,890 | $12,324 |
| 2022* | $21,019 | $12,455 |
| 2023* | $21,150 | $12,587 |
| 2024* | $21,281 | $12,720 |
| 2025* | $21,413 | $12,855 |