| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $29,544 | $26,856 |
| 2016 | $29,004 | $25,360 |
| 2017 | $28,626 | $25,629 |
| 2018 | $28,626 | $23,333 |
| 2019 | $28,284 | $26,037 |
| 2020 | $25,041 | $22,794 |
| 2021* | $24,715 | $21,524 |
| 2022* | $24,394 | $20,325 |
| 2023* | $24,077 | $19,193 |
| 2024* | $23,764 | $18,124 |
| 2025* | $23,455 | $17,115 |
