| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $21,668 | $14,253 |
| 2016 | $22,140 | $13,146 |
| 2017 | $22,825 | $13,037 |
| 2018 | $22,825 | $14,849 |
| 2019 | $23,673 | $14,043 |
| 2020 | $23,760 | $14,130 |
| 2021* | $24,278 | $14,013 |
| 2022* | $24,807 | $13,896 |
| 2023* | $25,348 | $13,781 |
| 2024* | $25,901 | $13,667 |
| 2025* | $26,465 | $13,553 |