| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $17,456 | $13,693 |
| 2016 | $17,524 | $13,682 |
| 2017 | $17,072 | $12,264 |
| 2018 | $17,072 | $12,352 |
| 2019 | $19,164 | $14,224 |
| 2020 | $19,496 | $14,556 |
| 2021* | $19,572 | $14,661 |
| 2022* | $19,648 | $14,766 |
| 2023* | $19,725 | $14,873 |
| 2024* | $19,802 | $14,980 |
| 2025* | $19,879 | $15,088 |