| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $24,348 | N/A |
| 2016 | $24,551 | $22,423 |
| 2017 | $26,001 | $22,613 |
| 2018 | $26,001 | $20,782 |
| 2019 | $26,027 | $21,991 |
| 2020 | $27,144 | $23,108 |
| 2021* | $27,369 | $23,792 |
| 2022* | $27,596 | $24,496 |
| 2023* | $27,826 | $25,221 |
| 2024* | $28,056 | $25,968 |
| 2025* | $28,289 | $26,737 |
