| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $22,609 | $13,475 |
| 2016 | $22,749 | $13,123 |
| 2017 | $23,165 | $12,303 |
| 2018 | $23,165 | $12,637 |
| 2019 | $23,225 | $13,512 |
| 2020 | $24,336 | $14,623 |
| 2021* | $24,487 | $15,019 |
| 2022* | $24,639 | $15,426 |
| 2023* | $24,791 | $15,844 |
| 2024* | $24,945 | $16,274 |
| 2025* | $25,100 | $16,715 |