| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $19,857 | $13,789 |
| 2016 | $20,237 | $14,775 |
| 2017 | $20,938 | $15,065 |
| 2018 | $20,938 | $14,533 |
| 2019 | $22,799 | $15,697 |
| 2020 | $23,011 | $15,909 |
| 2021* | $23,451 | $16,221 |
| 2022* | $23,898 | $16,539 |
| 2023* | $24,355 | $16,863 |
| 2024* | $24,820 | $17,193 |
| 2025* | $25,294 | $17,530 |