| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $19,265 | $15,786 |
| 2016 | $20,769 | $16,858 |
| 2017 | $21,407 | $17,822 |
| 2018 | $21,407 | $17,595 |
| 2019 | $22,574 | $18,298 |
| 2020 | $22,758 | $18,482 |
| 2021* | $23,457 | $19,221 |
| 2022* | $24,177 | $19,990 |
| 2023* | $24,919 | $20,790 |
| 2024* | $25,684 | $21,621 |
| 2025* | $26,473 | $22,486 |