| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,790 | $17,389 |
| 2016 | $24,760 | $18,408 |
| 2017 | $25,401 | $17,878 |
| 2018 | $25,401 | $16,594 |
| 2019 | $27,153 | $17,006 |
| 2020 | $27,234 | $17,087 |
| 2021* | $27,939 | $17,169 |
| 2022* | $28,663 | $17,251 |
| 2023* | $29,405 | $17,334 |
| 2024* | $30,167 | $17,417 |
| 2025* | $30,948 | $17,501 |