| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $22,069 | $15,399 |
| 2016 | $23,448 | $16,240 |
| 2017 | $23,787 | $19,060 |
| 2018 | $23,787 | $19,171 |
| 2019 | $26,352 | $21,651 |
| 2020 | $28,824 | $24,123 |
| 2021* | $30,626 | $26,878 |
| 2022* | $32,540 | $29,947 |
| 2023* | $34,573 | $33,367 |
| 2024* | $36,734 | $37,178 |
| 2025* | $39,030 | $41,424 |