| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $21,404 | $15,910 |
| 2016 | $21,388 | $14,345 |
| 2017 | $22,453 | $13,524 |
| 2018 | $22,453 | $13,366 |
| 2019 | $22,761 | $13,003 |
| 2020 | $23,252 | $13,494 |
| 2021* | $23,571 | $13,127 |
| 2022* | $23,893 | $12,770 |
| 2023* | $24,221 | $12,423 |
| 2024* | $24,553 | $12,085 |
| 2025* | $24,889 | $11,756 |
