| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $25,338 | $18,422 |
| 2016 | $26,144 | $19,823 |
| 2017 | $26,602 | $20,718 |
| 2018 | $26,602 | $19,966 |
| 2019 | $24,740 | $19,960 |
| 2020 | $25,078 | $20,298 |
| 2021* | $25,422 | $20,641 |
| 2022* | $25,770 | $20,990 |
| 2023* | $26,123 | $21,345 |
| 2024* | $26,481 | $21,705 |
| 2025* | $26,844 | $22,072 |