| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $18,568 | $14,558 |
| 2016 | $19,190 | $15,018 |
| 2017 | $19,566 | $15,374 |
| 2018 | $19,566 | $15,577 |
| 2019 | $20,252 | $15,707 |
| 2020 | $20,680 | $16,135 |
| 2021* | $21,116 | $16,517 |
| 2022* | $21,562 | $16,909 |
| 2023* | $22,017 | $17,310 |
| 2024* | $22,481 | $17,720 |
| 2025* | $22,956 | $18,140 |