| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $24,485 | $19,808 |
| 2016 | $25,046 | $19,959 |
| 2017 | $25,730 | $20,885 |
| 2018 | $25,730 | $20,193 |
| 2019 | $25,589 | $20,214 |
| 2020 | $26,222 | $20,847 |
| 2021* | $26,822 | $21,005 |
| 2022* | $27,437 | $21,165 |
| 2023* | $28,065 | $21,326 |
| 2024* | $28,708 | $21,488 |
| 2025* | $29,365 | $21,651 |