| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $21,407 | $15,591 |
| 2016 | $22,130 | $15,911 |
| 2017 | $22,355 | $16,371 |
| 2018 | $22,355 | $14,122 |
| 2019 | $23,284 | $17,479 |
| 2020 | $23,665 | $17,860 |
| 2021* | $24,053 | $18,249 |
| 2022* | $24,448 | $18,647 |
| 2023* | $24,849 | $19,054 |
| 2024* | $25,256 | $19,469 |
| 2025* | $25,670 | $19,893 |
