| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,736 | $12,622 |
| 2016 | $20,814 | $12,054 |
| 2017 | $21,094 | $12,241 |
| 2018 | $21,094 | $12,316 |
| 2019 | $21,932 | $13,431 |
| 2020 | $22,284 | $13,783 |
| 2021* | $22,585 | $13,997 |
| 2022* | $22,890 | $14,214 |
| 2023* | $23,199 | $14,434 |
| 2024* | $23,512 | $14,658 |
| 2025* | $23,829 | $14,885 |
