| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $18,418 | $12,538 |
| 2016 | $19,862 | $13,408 |
| 2017 | $20,468 | $13,689 |
| 2018 | $20,468 | $13,866 |
| 2019 | $22,703 | $15,828 |
| 2020 | $23,077 | $16,202 |
| 2021* | $23,781 | $16,584 |
| 2022* | $24,506 | $16,976 |
| 2023* | $25,254 | $17,376 |
| 2024* | $26,024 | $17,786 |
| 2025* | $26,818 | $18,206 |