| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $31,580 | $21,451 |
| 2016 | $32,400 | $22,588 |
| 2017 | $33,300 | $21,916 |
| 2018 | $33,300 | $21,151 |
| 2019 | $35,950 | $22,990 |
| 2020 | $37,474 | $24,514 |
| 2021* | $38,516 | $25,813 |
| 2022* | $39,587 | $27,181 |
| 2023* | $40,687 | $28,622 |
| 2024* | $41,818 | $30,139 |
| 2025* | $42,981 | $31,736 |