| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $24,719 | $18,964 |
| 2016 | $17,527 | $11,658 |
| 2017 | $21,989 | $16,660 |
| 2018 | $21,989 | $16,623 |
| 2019 | $22,453 | $16,820 |
| 2020 | $23,553 | $17,920 |
| 2021* | $24,050 | $18,133 |
| 2022* | $24,557 | $18,349 |
| 2023* | $25,076 | $18,567 |
| 2024* | $25,605 | $18,788 |
| 2025* | $26,145 | $19,012 |