| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $17,696 | $11,112 |
| 2016 | $18,234 | $10,939 |
| 2017 | $18,705 | $12,064 |
| 2018 | $18,705 | $12,353 |
| 2019 | $19,606 | $11,799 |
| 2020 | $20,538 | $12,731 |
| 2021* | $21,162 | $13,037 |
| 2022* | $21,806 | $13,349 |
| 2023* | $22,469 | $13,670 |
| 2024* | $23,152 | $13,998 |
| 2025* | $23,855 | $14,334 |