| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $22,151 | $16,407 |
| 2016 | $23,113 | $17,234 |
| 2017 | $24,613 | $19,239 |
| 2018 | $24,613 | $19,142 |
| 2019 | $25,350 | $19,145 |
| 2020 | $25,798 | $19,593 |
| 2021* | $26,569 | $20,051 |
| 2022* | $27,364 | $20,521 |
| 2023* | $28,182 | $21,001 |
| 2024* | $29,025 | $21,492 |
| 2025* | $29,892 | $21,995 |