| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,593 | $17,890 |
| 2016 | $23,940 | $17,573 |
| 2017 | $25,122 | $19,037 |
| 2018 | $25,122 | $18,414 |
| 2019 | $26,454 | $18,334 |
| 2020 | $26,828 | $18,708 |
| 2021* | $27,222 | $18,628 |
| 2022* | $27,623 | $18,547 |
| 2023* | $28,029 | $18,468 |
| 2024* | $28,441 | $18,388 |
| 2025* | $28,859 | $18,309 |