| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $17,872 | $10,017 |
| 2016 | $18,609 | $10,255 |
| 2017 | $19,146 | $9,300 |
| 2018 | $19,146 | $8,340 |
| 2019 | $20,888 | $13,126 |
| 2020 | $21,188 | $13,426 |
| 2021* | $21,800 | $13,733 |
| 2022* | $22,430 | $14,048 |
| 2023* | $23,079 | $14,370 |
| 2024* | $23,746 | $14,699 |
| 2025* | $24,432 | $15,035 |