| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,299 | $15,920 |
| 2016 | $22,970 | $18,975 |
| 2017 | $23,690 | $19,647 |
| 2018 | $23,690 | $19,777 |
| 2019 | $25,984 | $21,561 |
| 2020 | $26,622 | $22,199 |
| 2021* | $27,455 | $22,985 |
| 2022* | $28,315 | $23,799 |
| 2023* | $29,201 | $24,641 |
| 2024* | $30,115 | $25,513 |
| 2025* | $31,057 | $26,416 |