| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $17,863 | $12,720 |
| 2016 | $18,206 | $13,088 |
| 2017 | $18,390 | $13,237 |
| 2018 | $18,390 | $12,949 |
| 2019 | $19,053 | $13,108 |
| 2020 | $19,362 | $13,417 |
| 2021* | $19,676 | $13,582 |
| 2022* | $19,994 | $13,749 |
| 2023* | $20,318 | $13,918 |
| 2024* | $20,647 | $14,089 |
| 2025* | $20,982 | $14,263 |
