| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $29,922 | $23,326 |
| 2016 | $30,177 | $25,057 |
| 2017 | $30,454 | $24,743 |
| 2018 | $30,454 | $24,652 |
| 2019 | $31,674 | $23,063 |
| 2020 | $33,170 | $24,559 |
| 2021* | $33,475 | $24,468 |
| 2022* | $33,783 | $24,378 |
| 2023* | $34,094 | $24,287 |
| 2024* | $34,408 | $24,198 |
| 2025* | $34,724 | $24,108 |