| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $18,496 | $12,164 |
| 2016 | $19,486 | $12,703 |
| 2017 | $19,625 | $12,674 |
| 2018 | $19,625 | $12,762 |
| 2019 | $17,160 | $11,017 |
| 2020 | $18,862 | $12,719 |
| 2021* | $18,996 | $12,807 |
| 2022* | $19,131 | $12,895 |
| 2023* | $19,267 | $12,984 |
| 2024* | $19,403 | $13,074 |
| 2025* | $19,541 | $13,164 |