| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $18,655 | $14,513 |
| 2016 | $20,140 | $16,673 |
| 2017 | $20,530 | $15,373 |
| 2018 | $20,530 | $16,404 |
| 2019 | $24,180 | $13,861 |
| 2020 | $23,990 | $13,671 |
| 2021* | $24,455 | $13,484 |
| 2022* | $24,930 | $13,299 |
| 2023* | $25,413 | $13,117 |
| 2024* | $25,907 | $12,937 |
| 2025* | $26,409 | $12,760 |