| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $25,538 | $19,867 |
| 2016 | $26,463 | $19,249 |
| 2017 | $27,303 | $20,199 |
| 2018 | $27,303 | $19,675 |
| 2019 | $29,665 | $22,121 |
| 2020 | $30,070 | $22,526 |
| 2021* | $31,023 | $22,938 |
| 2022* | $32,007 | $23,358 |
| 2023* | $33,021 | $23,785 |
| 2024* | $34,068 | $24,221 |
| 2025* | $35,148 | $24,664 |