| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $27,825 | $17,499 |
| 2016 | $26,899 | $17,284 |
| 2017 | $27,249 | $17,881 |
| 2018 | $27,249 | $18,677 |
| 2019 | $27,991 | $18,925 |
| 2020 | $28,520 | $19,454 |
| 2021* | $28,891 | $19,999 |
| 2022* | $29,266 | $20,559 |
| 2023* | $29,647 | $21,134 |
| 2024* | $30,032 | $21,726 |
| 2025* | $30,423 | $22,334 |