| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $25,351 | $19,315 |
| 2016 | $24,876 | $18,488 |
| 2017 | $26,086 | $19,159 |
| 2018 | $26,086 | $18,270 |
| 2019 | $27,452 | $20,234 |
| 2020 | $27,677 | $20,459 |
| 2021* | $27,904 | $20,686 |
| 2022* | $28,133 | $20,916 |
| 2023* | $28,363 | $21,148 |
| 2024* | $28,596 | $21,383 |
| 2025* | $28,831 | $21,620 |