| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,960 | $14,730 |
| 2016 | $21,760 | $15,170 |
| 2017 | $22,060 | $15,839 |
| 2018 | $22,060 | $15,199 |
| 2019 | $23,810 | $15,813 |
| 2020 | $24,600 | $16,603 |
| 2021* | $25,417 | $17,274 |
| 2022* | $26,261 | $17,972 |
| 2023* | $27,132 | $18,698 |
| 2024* | $28,033 | $19,453 |
| 2025* | $28,964 | $20,239 |