| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,382 | $18,099 |
| 2016 | $23,706 | $17,086 |
| 2017 | $24,664 | $17,294 |
| 2018 | $24,664 | $17,527 |
| 2019 | $25,894 | $15,455 |
| 2020 | $27,142 | $16,703 |
| 2021* | $28,239 | $16,907 |
| 2022* | $29,379 | $17,113 |
| 2023* | $30,566 | $17,322 |
| 2024* | $31,801 | $17,533 |
| 2025* | $33,086 | $17,747 |