| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,954 | $18,028 |
| 2016 | $24,366 | $18,080 |
| 2017 | $24,879 | $18,532 |
| 2018 | $24,879 | $18,556 |
| 2019 | $25,744 | $17,748 |
| 2020 | $25,637 | $17,641 |
| 2021* | $26,078 | $17,664 |
| 2022* | $26,526 | $17,687 |
| 2023* | $26,983 | $17,710 |
| 2024* | $27,447 | $17,733 |
| 2025* | $27,919 | $17,756 |