| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $22,961 | $17,983 |
| 2016 | $23,649 | $18,498 |
| 2017 | $24,269 | $19,327 |
| 2018 | $24,269 | $18,597 |
| 2019 | $25,814 | $19,371 |
| 2020 | $26,581 | $20,138 |
| 2021* | $27,370 | $20,935 |
| 2022* | $28,183 | $21,765 |
| 2023* | $29,020 | $22,626 |
| 2024* | $29,882 | $23,522 |
| 2025* | $30,770 | $24,454 |