| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $15,722 | $9,925 |
| 2016 | $15,900 | $9,676 |
| 2017 | $15,986 | $9,624 |
| 2018 | $15,986 | $9,424 |
| 2019 | $17,588 | $12,578 |
| 2020 | $19,176 | $14,166 |
| 2021* | $19,393 | $14,090 |
| 2022* | $19,612 | $14,013 |
| 2023* | $19,833 | $13,938 |
| 2024* | $20,058 | $13,862 |
| 2025* | $20,284 | $13,788 |