| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $17,311 | $12,876 |
| 2016 | $18,108 | $13,228 |
| 2017 | $19,018 | $14,224 |
| 2018 | $19,018 | $13,881 |
| 2019 | $20,936 | $15,162 |
| 2020 | $19,380 | $13,606 |
| 2021* | $20,271 | $13,977 |
| 2022* | $21,204 | $14,359 |
| 2023* | $22,179 | $14,751 |
| 2024* | $23,200 | $15,154 |
| 2025* | $24,267 | $15,567 |