| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $28,978 | $20,666 |
| 2016 | $29,820 | $21,070 |
| 2017 | $30,323 | $21,288 |
| 2018 | $30,323 | $20,340 |
| 2019 | $32,108 | $21,564 |
| 2020 | $32,112 | $21,568 |
| 2021* | $32,655 | $21,790 |
| 2022* | $33,207 | $22,015 |
| 2023* | $33,768 | $22,241 |
| 2024* | $34,338 | $22,470 |
| 2025* | $34,919 | $22,702 |