| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,424 | $17,766 |
| 2016 | $23,439 | $17,339 |
| 2017 | $23,597 | $17,398 |
| 2018 | $23,597 | $16,560 |
| 2019 | $23,969 | $15,235 |
| 2020 | $24,872 | $16,138 |
| 2021* | $25,039 | $15,751 |
| 2022* | $25,206 | $15,373 |
| 2023* | $25,375 | $15,004 |
| 2024* | $25,545 | $14,644 |
| 2025* | $25,716 | $14,292 |