| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $26,021 | $20,128 |
| 2016 | $26,210 | $20,727 |
| 2017 | $27,242 | $21,130 |
| 2018 | $27,242 | $20,951 |
| 2019 | $29,980 | $23,077 |
| 2020 | $30,764 | $23,861 |
| 2021* | $31,570 | $24,572 |
| 2022* | $32,397 | $25,304 |
| 2023* | $33,246 | $26,058 |
| 2024* | $34,117 | $26,835 |
| 2025* | $35,011 | $27,635 |