| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $29,544 | $26,015 |
| 2016 | $29,004 | $25,255 |
| 2017 | $28,626 | $24,072 |
| 2018 | $28,626 | $23,235 |
| 2019 | $28,284 | $23,593 |
| 2020 | $25,041 | $20,350 |
| 2021* | $24,715 | $19,642 |
| 2022* | $24,394 | $18,958 |
| 2023* | $24,077 | $18,299 |
| 2024* | $23,764 | $17,662 |
| 2025* | $23,455 | $17,047 |
