| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $22,700 | $16,968 |
| 2016 | $22,719 | $16,554 |
| 2017 | $23,295 | $17,348 |
| 2018 | $23,295 | $17,913 |
| 2019 | $24,270 | $18,486 |
| 2020 | $24,388 | $18,604 |
| 2021* | $24,508 | $19,199 |
| 2022* | $24,628 | $19,814 |
| 2023* | $24,748 | $20,448 |
| 2024* | $24,870 | $21,102 |
| 2025* | $24,991 | $21,777 |