| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $13,737 | $8,376 |
| 2016 | $14,103 | $8,349 |
| 2017 | $14,362 | $9,272 |
| 2018 | $14,362 | $9,083 |
| 2019 | $14,732 | $9,105 |
| 2020 | $14,514 | $8,887 |
| 2021* | $14,781 | $8,859 |
| 2022* | $15,053 | $8,830 |
| 2023* | $15,330 | $8,802 |
| 2024* | $15,612 | $8,774 |
| 2025* | $15,899 | $8,746 |