| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $18,658 | $13,458 |
| 2016 | $19,096 | $14,209 |
| 2017 | $19,583 | $14,542 |
| 2018 | $19,583 | $14,550 |
| 2019 | $19,543 | $14,484 |
| 2020 | $19,750 | $14,691 |
| 2021* | $19,959 | $14,901 |
| 2022* | $20,171 | $15,114 |
| 2023* | $20,385 | $15,330 |
| 2024* | $20,601 | $15,550 |
| 2025* | $20,819 | $15,772 |