| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $29,544 | $21,200 |
| 2016 | $29,004 | $24,616 |
| 2017 | $28,626 | $24,845 |
| 2018 | $28,626 | $22,354 |
| 2019 | $28,284 | $21,935 |
| 2020 | $25,041 | $18,692 |
| 2021* | $24,715 | $18,342 |
| 2022* | $24,394 | $17,999 |
| 2023* | $24,077 | $17,663 |
| 2024* | $23,764 | $17,333 |
| 2025* | $23,455 | $17,008 |
