| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $25,774 | $18,144 |
| 2016 | $25,962 | $18,359 |
| 2017 | $26,052 | $18,050 |
| 2018 | $26,052 | $16,934 |
| 2019 | $29,398 | $18,734 |
| 2020 | $30,614 | $19,950 |
| 2021* | $30,837 | $20,185 |
| 2022* | $31,063 | $20,424 |
| 2023* | $31,289 | $20,665 |
| 2024* | $31,518 | $20,908 |
| 2025* | $31,748 | $21,155 |