| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $29,544 | $27,154 |
| 2016 | $29,004 | $25,278 |
| 2017 | $28,626 | $24,808 |
| 2018 | $28,626 | $25,167 |
| 2019 | $28,284 | $23,169 |
| 2020 | $25,041 | $19,926 |
| 2021* | $24,715 | $18,549 |
| 2022* | $24,394 | $17,267 |
| 2023* | $24,077 | $16,074 |
| 2024* | $23,764 | $14,963 |
| 2025* | $23,455 | $13,929 |