| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,939 | $16,963 |
| 2016 | $24,439 | $16,931 |
| 2017 | $24,813 | $17,214 |
| 2018 | $24,813 | $16,549 |
| 2019 | $26,737 | $18,221 |
| 2020 | $26,459 | $17,943 |
| 2021* | $26,864 | $17,909 |
| 2022* | $27,275 | $17,875 |
| 2023* | $27,692 | $17,841 |
| 2024* | $28,116 | $17,807 |
| 2025* | $28,546 | $17,773 |