| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,058 | $17,528 |
| 2016 | $23,740 | $17,456 |
| 2017 | $24,106 | $17,973 |
| 2018 | $24,106 | $17,725 |
| 2019 | $24,321 | $16,357 |
| 2020 | $25,743 | $17,779 |
| 2021* | $26,139 | $17,706 |
| 2022* | $26,542 | $17,634 |
| 2023* | $26,951 | $17,561 |
| 2024* | $27,366 | $17,489 |
| 2025* | $27,787 | $17,418 |