| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $24,096 | $19,330 |
| 2016 | $24,714 | $20,038 |
| 2017 | $25,062 | $19,697 |
| 2018 | $25,062 | $19,535 |
| 2019 | $26,404 | $20,694 |
| 2020 | $26,304 | $20,594 |
| 2021* | $26,675 | $20,495 |
| 2022* | $27,051 | $20,397 |
| 2023* | $27,432 | $20,299 |
| 2024* | $27,819 | $20,201 |
| 2025* | $28,211 | $20,104 |