| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $22,509 | $14,175 |
| 2016 | $22,719 | $15,663 |
| 2017 | $22,986 | $14,426 |
| 2018 | $22,986 | $12,838 |
| 2019 | $22,944 | $10,760 |
| 2020 | $24,000 | $11,816 |
| 2021* | $24,223 | $10,883 |
| 2022* | $24,448 | $10,023 |
| 2023* | $24,676 | $9,231 |
| 2024* | $24,905 | $8,502 |
| 2025* | $25,137 | $7,830 |
